This is a pretty good site I found for downloading xbox 360 games.
I download xbox 360 games from here WITHOUT a MOD CHIP! (sorry forgot to mention that in the video!). They charge a small one time fee and then you can download unlimited xbox 360 games for free.
They give you the software you need to bypass the security of the xbox 360 without voiding your waranty. I've also been playing these games online without any problems (they have stealth patch downloads so you don't get banned from playing online).
They even have the RED LIGHT FIXES and other tutorials.
Its pretty much got anything you need for xbox 360 including other downloads. If you buy from them, they even have a 60-day hassle-free money back guarantee, so you can return it if you don't like it. I think its totally worth it though, hope you do too!