I asked. Seriously, I found a site that I liked and I asked if they wanted some reviews. I started writing reviews of games that I already had and after I had a few done the owner eventually began asking me if I wanted some crappy games. After cutting my teeth on the crap, I began getting some of the good games. I also really put work into it by contacting game companies and requesting interviews. That's my story and how I got to go to E3 for three consecutive years. Believe it or not, it's not that hard, but after a while it does become work and you'd almost prefer to get the crappy games, so that you can enjoy the good games.
Anyway, I don't have Guitar Hero 80's Edition or The Darkness. I'm currently working on Odin Sphere, Shadowrun, Spider-Man 3, Shrek the 3rd, Tenchu Z, Death Jr. and the Science Fair of Doom and one more 360 game from Midway about WWII. I write for a second site as well, but not very often and they've only sent me two games so far. The goal is to do freelance and work from home, but until then I'll try my luck at getting free stuff to get myself some extra cash and nice things that I wouldn't otherwise buy on my own.