If you've followed my other entries about Remote Desktop, you'll note that one of the ways to connect to a remote system requires you to connect to to the SSH client running on your local machine by specififying an IP of 127.0.0.2. SP2 shuts this down. Well, it looks like Microsoft has rethought this and has issued this hotfix (MSKB article 884020) to address it.
There's some other, somewhat related information in MSKB article 817293, too.