Skype Screen Sharing Is A Huge (And Free) Productivity Tool
A more recent skype feature worth an upgrade is group video calling: http://blogs.skype.com/en/2010/05/group_video_calling.html
I use this daily with my dev team. It's great because skype is cross-platform, easily traverses firewalls/NAT, and combines the screen sharing with voice chat.
Any competing tool (or set of tools) would have to accomplish those same goals.
Also, I tend to use skype (or email) whenever I have to paste a large block of text (like a stack trace), since Yahoo and AIM both avoid sending messages if they're too long.
If your internet connection is too slow and skype/ichat screen sharing is laggy, I recommend ssh+screen+vim/emacs
Not sure if it is available for Linux yet. One can try yuuguu, but it's only free for up to 100 minutes/month: http://www.yuuguu.com/features/skype-integration
Skype and a cell phone (with Skype App) are all you need. In many ways, Skype is the killer app of the 21-st century.
I've been giving demo's of my company's beta over skype for a few weeks... it's so simple. Everyone has it and I can tailor each demo to each person and they can actually see it working live, ask questions, etc. It's wonderful.
I would prefer such a thing as an XMPP extension.
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Is it remote desktop too? Can you take control of the users computer as well?
Does anybody know how this compares to AIM screen sharing with audio?