I don't know how accurate this list is, but these are the one's I've entered and have had no trouble connecting:

router.limewire.com
connect1.gnutellanet.com
connect2.gnutellanet.com
connect3.gnutellanet.com
connect4.gnutellanet.com
gnutella.hostscache.com
gnet2.ath.cx
connect1.bearshare.net
connect2.bearshare.net
connect3.bearshare.net


There used to be a list on LimeWire's site. I can't find it now. Hope these help.