Where do I get instruments for Milkytracker?
I came across all the ST-XX disks on the net last year -- they're not actually that useful, though, being low-fi and of an indeterminable legality. They were great for messing around with back in the day, but I'd look elsewhere now.
It looks like you can draw simple waveforms in Milky (like you could in OctaMED) so that's a starting point. If you've got a Creative card or soundfont host you could download some free soundfonts ( http://hammersound.net/ ) and sample from those (license permitting), or generate some samples with some VSTi's ( http://www.kvraudio.com/ ).
I'm going to have a quick look around for decent free sample collections but I'm not aware of any famous ones.
EDIT: Oh, I should mention also that in Modplug Tracker you can drag MIDI instruments right into the sample editor -- however bad your MIDI is, it probably has a few usable sounds.