After graduation and my last day at work, I've taken a road trip to visit the Bennett's in D.C. and was promptly chagrined while trying to show off Leopard's screen sharing over OpenVPN.
Fortunately, it's pretty easy to turn on Screen Sharing from an SSH session.
echo -n enabled > /Library/Preferences/com.apple.ScreenSharing.launchd
Launchd should automatically start the Screen Sharing service when this file is modified.
More information is available at
Apple Remote Desktop: Configuring remotely via command line (kickstart)
