So yesterday I had to format my Mac partition due to a corrupt filesystem. I switched a few times between Mac and Windows to play Warcraft 3 and Company of Heroes, and apparently doing it too much without letting it shut down properly can cause errors.
I spent about 3 days trying to save my files with no success :(
So to all Mac users, shut down properly and run Disk warrior/Disk utility every couple of weeks to catch errors before they get out of hand.