Ralph Perdomo reports that he has ported OS X Front Row to Lion by moving several frameworks and the application itself from his old Snow Leopard install. He wrote up the procedure over on his weblog and has provided an optional installer for anyone who didn't keep a Snow Leopard install around.
Perdomo reports that the re-installed application seems to work well, and he does not seem to have run into conflicts from what I can tell. The frameworks/app in question are:
/System/Library/CoreServices/Front Row.app
/System/Library/PrivateFrameworks/BackRow.framework
/System/Library/PrivateFrameworks/iPhotoAccess.framework
/System/Library/LaunchAgents/com.a
