i read the first 4 pages before i got eye fatigue, but if i may contribute...
i'm currently doing a "one man band" project that's a blend of organic and synthetic. i record guitars over synth drums/bass/etc (using FruityLoops). i then put it on a CD or MP3 player. i perform live, right along side "full" bands, by playing the recorded stuff over the PA system, and singing over it (much like rap artists do). i try to make the live show a full production, instead of just a musical exhibition. if you want to see what i'm talking about, you can go to www.lascivial.com.
i'm not into the idea of an online collaboration, but my setup could easily be used as such. i think the idea is totally feasable.
incidentally, if there's anyone reading this from the Northern Viriginia/DC area, i would love to put a full band together.