Without any doubt already high on the priority list, but seeing this in the list may ease the pain caused by Lion's awful built-in screen sharing.
This is being actively worked on, but no definitive timetable has been set for it's release.
Glad to hear work is in progress! I need one VNC server solution for all OSX versions.
The Vine Server 4.0 Beta does the job for me under Lion:
Some users experience some rough edges, see the forums ( http://www.testplant.com/phpBB2/viewforum.php?f=3 ) but it's still useful (and the only good free solution I know).