Well even though you retracted your comment topho, you can find some info on "geohot" on a Wiki page about him:
Google really is a most wonderful tool!
I would just like to take this time to point out:
"started playing around with the PS3 late last year"
He was able to do, in a couple months, what the idiots over at PS3News have NEVER BEEN ABLE TO DO in YEARS!!!!
I just retracted, because everyone is always asking, "How do I become a hacker." Just looking for some concrete ideas. It simply amazes me the work that GeoHot has done, and would definitely pursue any projects that led him to this point.
StreeskaterFU has posted a response to George Hotz recent exploit on his Blog. It's an interesting read: