i don't remember the last time i bought a console game.. oh wait. def jam for gamecube a while back.. i kept the case because it was plastic. i didn't keep my NES boxes, but i kept my sega ones when they were in the shell cases. the only pc game i've bought since the retail boxes were made smaller is ut2004, and i still have the case for that one, since it is pretty high quality cardboard and sadly there aren't jewel cases for the CDs.

when i had a playstation of course i kept the jewel cases, and i keep the jewel cases for my albums and the clamshells for my dvds. if i bought current generation videogames i'd keep the cases as long as they weren't shitty paper.