Gizmo Project
There are many "Skype-killers" out there at the moment, but until GoogleTalk has a Linux client for it's VOIP service the best of the bunch appears to be the Gizmo Project. It uses SIP, an open standard unlike Skype, and they just started shipping a Linux client (albeit in beta form). Even better news is that it appears that the source for the client will be available shortly, and it uses GTK+ 2.
It also has a dependency on Apple's Bonjour, so I guess it will automatically find other Gizmo Project users on the local network. If the client will connect to a local server, then that is a really nice it-just-works implementation of VOIP for internal office calls.
NP: Dub Come Save Me, Roots Manuva
