If I had not shame I would of course use this as an opportunity to plug my upcoming game "Squid Drop" and direct you towards SquidDrop.com. I won't though.
To be a bit more serious, there are several nice iPhone-game-sites out there, TouchArcade (my personal favorite) and SlideToPlay probably the two premium ones.
I'm not permitted to post URL's just yet, so you'll have to type them yourselves.