There's a writeup on SpywareGuide that explores the world of Xbox Gamerscore hacking, and how high Gamerscores are proving to be a big target for hackers and phishers. It also talks about how a recent release of a Gamerscore-altering program onto forums for hacking & cheating is proving to be lucrative business for both eBay sellers and those who want to artificially inflate a Gamerscore before selling that account, or trading it for credit card details