I saw this feature in eDonkey2000 (still don't know if that's a gnutella client)
If your search does not yield any results, or if you just want more hits, you can extend your search to other servers.
Another great thing about it is that you can see a list of available servers and choose which one to connect to

until then, I don't think i'll be using Xolox that much. Everything else about it is very good.

philtre