OT: Winamp on the PC plays .IT files, though I've found some playback bugs here and there. For older MOD formats (.mod, .xm, .669, .ult, .mtm) it works extremely well. XMplay for PC works extremely well for .IT files. Or, if you happen to still be running win95/98 you can just download Impulse Tracker itself at
www.noisemusic.org/it.
I used Impulse tracker for years, but have since moved on to Renoise (
www.renoise.com). The interface is very similar to Noisetrekker.