BurnAtOnce CD Burning
Burnatonce can master data and audio discs, read/write image files and copy on the fly. It's drag and drop interface has multi-language support and is fully compatible with XP themes.

CDBurnerXP Pro CD/DVD burning
CDBurnerXP Pro is a FREE CD/DVD burning solution. With this software you can burn CD-R, CD-RW DVD+R/RW DVD-R/RW discs. This is really good software and reminds me of Roxio. Watch for the adware during the install.

ISOburn
A great utility to burn CD ISO images quickly.

dBpoweramp
dBpoweramp supports practically every audio type created: mp3, mp4, m4a (iTunes / iPod), wma, Ogg Vorbis, AAC, Monkeys Audio, FLAC, the list goes on....fully compatible with Windows Vista, 98 / ME / NT4 / 2000 and Windows XP

DeepBurner Free
DeepBurner comes loaded with an extensive list of practical and valuable features. These start from compiling your CDs and DVDs in different formats and ending with the creation of fascinating photo albums and rock solid, reliable backups

DVD Shrink
DVD Shrink is software to backup DVD discs. You can use this software in conjunction with DVD burning software of your choice. Most DVD video titles are simply too large to fit, without modification, onto a single recordable DVD-R disk. DVD Shrink overcomes this problem by compressing or "shrinking" the data from your original DVD.

MrBass.org
Great site with lots of DVD related links