Xolox is a decent gnutella client. I wouldn't go so far as to say it is the best. It does have some pitfalls and bugs that need to be fixed. But for the money it is the best (and only) threaded download application that uses the gnutella protocol. I just that it would add some extra file extensions to the base listing. It needs to have:
.001
.002
.003
.etc
.r01
.r02
etc.
.nfo
.sfv
.cue (it has .bin but no .cue which makes no sense)
.ccd (clone cd image)
.cdi (disk juggler image)
.nrg (nero image)
.m2v (svcd file format extension)
and I'm sure there are many more that I'm missing right now. I would apprecate anyone extending on my list and I will start a thread to the authors possibly getting them added.