If you have plenty of old CDs or DVDs that you'd like to copy so as not to lose the data (audiobooks, movies, recordings etc), the Nero program will be very useful to you. You can both copy and burn ...

My 25gig collection of audio is sourced from discs that I've bought, and it'd be very handy to compile some of these tracks onto CD-R to build up genre-specific playlists for my Xbox.