http://www.plopbox.net/
http://iiichan.net/boards/music/
http://amp.dascene.net/home.php
http://www.exotica.org.uk/wiki/UnExoticA

Tracker music, demoscene, etc etc etc.

I wish I could say I live for it, but alas I have never had the attention-span to attempt composing. ModPlug Tracker, FastTracker, and pxTone are all ludicrously easy to sorta get your feet wet but I never got around to it :/

also; somewhat related:
http://www.youtube.com/watch?v=mJ7q8PXOfq4&fmt=18
lol