i used to use CDRWs quite a lot for temporary backups, data transfers from one place to another etc. now i hardly use them, i've plenty (good ones too!) that are brand new!
i use DVD+RWs for the same purposes + but primarily to watch backed up movies on the living-room DVD player.
if i had a 4GB USB drive i'd probably use them a little less, but i don't, these things are dreadfully expensive around here. but then like i said the main usage is for burning videos to watch on the living room player.
i have lots of DVD+RWs too
bough a 25 spindle, that was a mistake.
i'm intending to get (or at least try to) some DVD-RAM for data backup.
a long long time ago i used to burn CDRWs with DirectCD4 (university computer). later gave InCD a try on my home computer but gave that up very quickly. since then i just use a regular burning app: usually Nero, sometimes burnatonce. now also ImgBurn of course.
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
M.C. Escher - Reptilien