Yesterday, Skype released their new Skype 4.1 Beta. Apart from bug fixes and minor additions, the major new feature is built-in screen-sharing. Although the Mac version has had this for awhile, it will now be available for Windows. To use it, both users will need to have Skype 4.1.
Other notable features include contact sharing, birthday reminders (really nice for those like me who can’t keep birthdays straight), and extended contact importing capabilities (adding support for “email content providers”).
Again, this is a beta, so there will probably be some bugs in it. This isn’t like installing a service pack or OS beta, though. so don’t lose sleep over it.
You may download it here: http://www.skype.com/download/skype/windows/beta/
The release notes are available here: http://share.skype.com/sites/en/2009/05/27/Skype%20Release%20Notes.pdf