The possibility of sharing your stuff with your beta via google-wave is missing :D. But I guess that's understandstable since it's still in beta-phase.

I only use google-docs if I have to (because duh... might not be my computer I'm currently using or something), mainly due to the lack of formatting options (like indentation).

I actually only write with pen and paper when I'm pissed off with the computer (because hard drive went to nirvana or something and all my files are lost again) because then I always think: damn, if I wanted to destroy it completely, I'd have to burn it! :D
Or sometimes I have a little notebook to keep ideas and dialogue fragments or something whenever they pop into my mind.