is there any online trading card game or something else that uses low memory, so i have something to do while my c4ds render?
Pokemon Trading Card Game for the Gameboy Color! But really though, if you havn't already tried it, Runescape is fun for a while, and takes up only as much RAM as your browser uses (usually.)
Ehh, branching away from video games... When I have a little bit of time to burn I like to surf www.digg.com. Also, if you're into it there's stepmania.... you may like it may not.
plenty of sites, spelle.nl for example has heaps of flash games, I usually just watch a movie when Im rendering something.