Some threads you should look at:

Xolox's HTTP headers.

XoloX = BearShare 2.3.0 ?

A document of protocol implementation differences?

Supernode Specs

FFHP v0.9 -> HUGE v0.92

Other stuff to read is here. Specifically, the Pong cache spec, the Gnutella 0.6 Handshaking Protocol, and the Cultiv8r Extended Query Hit Descriptor - version 0.6 (Another client which probably breaks XoloX now, hopefully this document will help the extra data interpetation problem)

I understand you guys might have lives and stuff... but it doesn't take much to join the gdf discussions... just a free yahoo account.