Hi Dave, Adobe has a server that is hosting lens profiles voluntarily contributed by the user community. If you build a profile using the Lens Profile Creator tool, there is the option in the software to send the profile to the server, thereby sharing it with the community (entirely optional, of course). On the other side, users can use the LC plug-in in CS5 to search online (via this server) for such profiles contributed by other users. The idea is that if you have a lens for which Adobe has not provided a profile, there is an opportunity to check if somebody else has already built a profile for that lens and shared it.
Thanks, that is GREAT news! I presently use DXO, but many of my body/lens combinations are not in it.