The only program that I couldn't run on Windows XP was Cubase. This never worked for me under Win2000 either but worked just fine under Win98/ME. Since Windows XP code is mainly based on Win2K, I didn't really expect it to work.
Other than that, SoundForge, WaveLabs, Cakewalk Sonar, ProAudio 9 all work great!

Regards
- Claude