Started two games, one as a goodie two shoes the other as a dick.  Even going so far as to name my dick character Asshole, my father loved the name so I kept it.  Anyway, when I got to megaton there was a caravan sitting outside.  I ended up killing the two guys and took a scoped magnum off of one of the guards.  
When entering megaton the sheriff approached and I promptly proclaimed that I was the new sheriff in town.  I backed up this claim by getting a critical hit on his cranium which caused his head to explode in to gooey chunks, complete with eyeballs which rolled all the way down a hill.  One settler decided to take me on after questioning my abilities as the new sheriff but I ended up quelling that argument pretty quick with a double tap to the head.  I took the sheriff's Chinese Assualt Rifle and headed around town seeing what else I could shoot.
I ended up in some repair building that had plans for a "Rock-it launcher".  Killed the chick that had those (with a little girl watching no less) and stole everything I could from the shop.  The good stuff included: a real rocket launcher, shotgun, assault rifle, grenade, mine, and plenty of ammo.  I also got enough parts to make the "Rock-it launcher" which I created immediately.  After taking out the chick who owned the store some mercenary tried to take me out but with all the loot I had he was taken down quickly.
I then headed to the bar where I entered just looking for a drink, but was met with about 6 townsfolk who decided it would be best if I was no longer sheriff.  This screenshot explains how that story ended up: 
http://img517.imageshack.us/my.php?image=screenshot0li8.jpg.  Those two dudes came back to sit down as soon as I put my gun away.  I'm sure they realized that I was just doing my job as sheriff.
Overall I'm loving the game now that I've turned in to such a dick.  I was enjoying it before, but I got to about the same point with my "good" character and I didn't even have any ammo left.  Now I'm stocked for battle and I don't even need to worry about killing everyone in megaton by blowing up the bomb because, if things keep going as they are now, I'll just do it myself.