you save all your pics...all of em? thats a lot of space and (most likely) some useless shots in that bunch. blurred/out of focus/badly exposed etc pics get deleted if they cant be fixed. boring pics too. i clear space like its spring cleaning
right now, my 4gb card in the camera is almost full...ill probably keep about 20 pics out of the 220ish. after looking through my pics, i was like "what am i going to use this for/why did i keep it/whats the point of this pic?"
i always think that i may need that strange or slightly different angle pic...
i delete some of the bad exposures on camera....or when i go to download i simply don't download them....but if its in focus and exposed correctly i keep it...