How can I use GoogleTalk with voice chat capability on Linux? I understand GAIM does not provide voice chat capability.

net yet, but i bet with googlechats existance, it will be bumped up a few knotches on the priority list

also, check out teamspeak. it has a native linux client

gaim (2.0) will have voice chat and it will be able to talk to googletalk as the developer of gaim have been hired by Google

"
Working at Google

I (Sean) have been hired by Google, moved to Seattle, and have been working on the Google Talk team for about a month and a half. The goal of Google Talk is to make real-time communication as open as possible, and in that regard, I've been working to offer all of Google Talk's features into other clients. Currently, I'm working on making it as easy as possible for other clients to use Google Talk's voice features. You can expect Gaim and other clients to be interoperable with Google Talk's voice features in the near future.
"

http://gaim.sourceforge.net/