You can put custom firmware on older models, don't think you can on new ones as they have the 3.60 firmware on them already and you can't downgrade. Also can't go online with CFW and most new games require firmware 3.60 so can't be played on CFW unless the pirates release a patch for them.
As for movies, you can always just set up your PC as a media server and stream them through the PS3.
~ PSN - Trent_Steele ~ Steam
~ Battle.net - Chief#6843