Here's whatsnew:

Updated: Rewrote 2600 TIA sprite positioning code, resolving some known issues
Updated: Moved to .NET Framework 3.5
Updated: SDL.dll to version 1.2.13

Get it here:
http://sourceforge.net/project/showfiles.php?group_id=87365&package_id=91006&release_id=610494

-Trebor