Skype has released a beta version of its software for Windows which includes a screen sharing feature.
The Skype 4.1 release also reinstates some extras that were removed in the previous update - much to the disappointment of many subscribers.

Yuuguu has expanded its screen sharing cross network application to include Skype.
The Yuuguu for Skype Beta enables Skype users to screen share and collaborate with one or more contacts.