this might be a total newb question and hopefully i won't get flamed to hell for it. but being new to the ps3 (got it a week ago using money from wedding gifts

) i see a lot of stuff on linux on ps3 and also see sony approves this stuff. i guess to get to the point i'm just wondering what all can be done with using an os; can i play moving i put on the hdd like with a modded xbox, can i play homebrew and emulations this way and can i play back up ps1, 2, 3 games? if anyone has any info on this stuff it would be really helpful (maybe on how to get the os, install it, and running it) anyway thanks ahead for the help.