Gotta agree with Dave on this -
Sure it isn't
that secret, but it is very controlled.
The hub's location is not well known, plus it is by invite only - ya don't have a member account there, you're not getting in.
Doing it all this way could give more insurance against getting closed down or harrassed, but more importantly, it will be MIDI specific (as Dave pointed out), meaning that you're generally not going to have to sort through 9 million non-midi search results to find what your looking for. It's aaaaaall about da MIDI.
Depending on how things go, there might be related hubs added for mp3 or audio ware - whatever. This is a test run right now, though.
WinMX is a nice p2p application, though - I use it personally on occasion - thanks for bringing it up. Ideas do make the world go around, and that's how this hub thing got going in the first place. Just people talking about ideas.
IF there are good midis owned by WinMX users - grab em' and bring em here