A recent comment posted on my RBTray review tells of a Vista/Windows 7, 32bit and 64bit compatible RBTray.
To quote the (new) developer "I made RBTray Vista/7 and x64 compatible, removed the application menu additions altogether, and fixed the small target on the minimize button with XP theming (that was not intentional BTW). It’s on my site and on the official RBTray SourceForge page as well".
This is probably my favorite minimize-to-tray app, if just for being so lightweight (about 1 meg in memory). It was also featured on my "Forty-Three of The Best Free Windows Enhancements That You Should Know About" posting.
Version Tested: 0.41