I couldn't help but notice that I'm not the only one on these boards that writes music, and there's no better subject to bring up than the tools that we use to go about doing it! ^_^
Personally, I can't play music; although I can still pick out a tune on piano/keyboard if I have to. When I write, I just pound it all in with the mouse one note at a time (with the occasional copy & paste). For MIDI music, I create the initial file with Cakewalk Home Studio 8 and give it the final touches with WinJammer Shareware. Converting to wave format is done with Winamp via its DirectMusic interface, and final touches & MP3 conversion are done in GoldWave.
So, the question for our other musicians: what tools do you use to write music?