It leads down a story path where you discover the zombie cure, save the world, and live happily ever after.

How did stationwagon man get the other half of the radio? I thought Clem said her parents had it?

Turned out I played the game quite similar to others, except for a few choices, where I was clearly in the minority.
First episode I lied to Hershel, chose Shawn over Doug (figured Kenny would go for his son, so I tried to save the other), defended Kenny against Larry (although I actually tried to reason, but the game wouldn't let me), gave the gun to the infected (I was surprised other team members found that a strange decision, I thought it the most human thing I could do) and saved Doug at the end. Not for any reason, just because he seemed to be closer to me, so easier to safe.
Somewhere in that episode I also failed to safe Clementine from the toilet walker, due to shaky hands at shite reflexes, felt really bad that I couldn't save her myself.
In the second episode I chopped the leg off of that guy, seemed the quickest way to get him out, I didn't shoot Jolene, as I though she had some information about Clementine (she was talking like she new about her history, turned out she'd just been spying on us, and didn't know that much). 
I didn't kill Larry, as I was pretty sure the whole story about how you turn when you died was a fake, and wanted to give him a chance, also, I didn't want to upset Lily. I kinda felt for her, she was a strange one, but seemed to care more about the others than Kenny, who was just caring for his family and me and Clementine. 
I killed both the brothers, as I was just really pissed with everything that happened, Kenny getting people upset while he didn't have to (the killing Larry part), the whole false kindness of the family, while I was trying to be as honest as I could etc. Just needed to vent, and I couldn't see any reason he had to live as well.
I also stole the food. I was tired, just killed two guys, lost one I liked (Mark), Clementine had seen so many things I didn't want her to see. Food just seemed to be one of the more positives things that came along, and I needed it, explained it all to Clementine. Even though she didn't like my choice, it looked like she accepted my choice. That was important to me, that even when I do things she might not like, she wouldn't see my as a bad person.
Episode 3, I didn't kill the girl, we needed the time to get over that brick wall, and Kenny wasn't very good at helping me getting over it.
I also didn't abandon Lily, I just couldn't, even if she just shot Doug. Was under the impression we still could use the numbers in our team, that this thing might actually realize her she was making some awkward choices, and by showing that I still cared enough to have her on the team, she might change a bit. I also still felt bad to what happened to Larry. I was wrong.
I got in a fight with Kenny, but I never really could get a good impression of his character, and he always reacted in a way I didn't suspect, so wasn't really looking for a fight, it just happened. I blame Kenny, shouldn't be so unpredictable then.
I shot Duck, was the only reasonable thing to do. Like some else said in this thread, he'll always be my Robin. That bit was some quality writing I thought.
I helped Omid on the train, but, like the choice between Doug and that girl at the start, it was more based on where my cursor was, and it turned out to be closest to him. I just wanted to get one of them, and ofcourse preferably both on the train.
This episode also had the introduction of a pretty awesome character, Chuck. Shame he went his own way later on, felt bad that us taking his home has ended his life (with which he seemed to be satisfied) the way it had.
Onto episode 4, I let Kenny kill the boy in the attic, timed to get rid of the ghosts in his head I thought, I was the one to bury him in the end. Great start of this episode I think.
I didn't lie to Vernon, didn't see why, and when I lied at the farm in the first episode, it will only take more time to explain and gain some trust. After that moment in the game, I never saw a reason to lie, only postponed my answers if I could, not gonna explain shit when I need to concentrate on surviving.
Than probably the hardest choice came, bring Clementine with me or not. I decided she had to stay at the house, and I was quite glad I did. I trusted her enough that I gave her the gun when I left, and she used it quite efficiently it turned out, a walker crept into the house, and she managed to kill it, and keep Omid safe as well.
I guess the whole scene at the "safe zone for healthy people" (forgot the name) was quite scripted from the beginning? I wondered if there was a way I could have saved Molly, I like her, and she had some skills. I just didn't have enough ammo and not a good enough aim to keep the walkers off of her. Felt bad to see her go, she was strong, and would have survived if we hadn't come along.
I let Ben die, was getting sick of him, he wasn't able to look after the girl, gave medicine to the bandits, wanted to talk to Kenny about that when there were walkers everywhere. He was unreliable, and didn't seem motivated enough to keep going, so I did what he asked.
Was wondering about that scene though, Vernon pops his head back in and asks if we came via the train track, and I think it was mentioned one more time. Couldn't really figure out what it related to.
And at the end, I revealed the bite, honest as I am. Seem to have just Omid, his girl and Kenny after some whining, with me to safe Clementine.
So, the last episode. I let Christy remove my arm, I was gonna die anyway, so why not give it a shot. I felt I started to care less about myself and the group, just wanted to get as much people as possible back to Clementine. Somewhere on the rooftops I lost my temper with Kenny again, think soon after he got killed, because he did the decent thing and helped Christy out. It was his fault after all that the radio had fallen. Losing loads of people here, but to be honest, they start to feel as extra weight, got sick of all the arguing, specially when one of the bravest members of the group had just been kidnapped.
Omid and Christy go first onto the hotel rooftop, knocking down the sign. Never to be seen again, this was quite strange to me, specially as the hotel seemed to be clear of walkers.
So I went down onto the streets with my butchers knife, and just hacked my way trough them all. Felt great to do something for once that required so little thought, just hacking and slashing away, and try to empty my mind. So much has happened. I was tired, and the repetition of locking onto a head and making a horizontal swipe felt comforting in some way. No one arguing little things behind my back either. Just me, walkers that didn't care, and one simple goal, get into the hotel to get Clementine.
Once inside, I talk a bit with the stranger. Turns out my wife worked abroad a lot, and one day when I got home early from school because I was sick, I caught her in bed with another. Apparently killed the man, and that's all that's said about that. I've never lied to the others, at least I think not, but I was too tired to talk too much with this stranger. Just did my best to stay calm, gain some trust, and hopefully see Clementine again.
I lay my stuff on the table, both the knife and radio. Like I said before, was too tired to try and go for him anyway. Luckily, brave Clementine showed up very silently, and noticed my nod towards the bottle. She smashed the strangers head, I jumped on him, fought a bid, and then Clementine ended it by shooting him.
Poor little girl, first she gets smeared under with walker blood, then sees her parents shuffling on the streets, thinks she saves me, while she actually makes it worse for herself. I tell her as soon as I get the chance. Heartbreaking stuff that. But I know she's brave enough to shoot me, and she is. She will survive this, that must have been my last thoughts while playing as Lee.
(And I, of course, told her as well to keep her hair short, I knew she appreciated these kinda comments.)