Well space hasn't been a big problem for me as yet, because I seem to be still stuck in the 35mm film frame of mind. That is to say, that when ever I go out to shoot it seem I still think I'm using film and so everything is shot in multiply of (36) usually around what would be (4) rolls of (36) exposure film.
Hard habit to break, even know shooting digital is free. Guess that comes from being taught to plan your shots before pushing the shutter.
darn good skill to have there, too. took me quite a while to acquire that - I spent a good amount of time with my 20D happily blazing away without putting too much thought into it. If I ever come across some very small CF cards for cheap I'm going to try and find out what it was like to have ~20-30 shots per "roll" 
1gb or less

