I recently needed to share my Windows desktop with a Linux user over the Internet. It took only minutes to install the Yuuguu client and start sharing my screen. Remote viewers don’t need to install anything, as there is a Web viewer. But if the remote participants do install the Yuuguu client, they can also request control of the presenter’s screen.
Yuuguu also gives you a telephone conference line with global dial-in numbers. It is a free service in the US, although you still have to dial long distance.
Yuuguu lets you chat across several instant messaging networks. And it works on Windows, Linux, and Mac.
Funny name, great service!