Read your blog about renting. Renting's great if you don't want to play the latest and greatest releases when they come out. Those are usually in high demand and demand far outweighs inventory. So sometimes you can luck out and grab a new release but most the time you'll get last months releases or older the fastest. Which is fine for throw away games or single player only games. If it's a big multiplayer release though, it's best to just hit the store and buy it.

On a regular basis i trade my games in or sell them. I try and get 30-35 for them so the next game i buy only costs 30 bucks. That's one way i cut down on my expenses because as you said, so many games.