WordPress MU

I apologize if this topic is here somewhere, but I couldn't find what I was looking for. I am just converting my network of sites to WPMU. They all have unique domains so I am using the multiple site plugin. I realize and love how it shares the user table so ONE account can login to every site. My question is, is there a way that I can "auto-login" a user or admin to EVERY site in the network after they login at any individual site?

So user is an active member at SiteA and logs in. They then browse to SiteB and they are still logged in on this site. Currently, they have to login individually on each one.

Any hacks/workarounds/plugins for this?

Thanks!
Ryan

This was discussed on the wphackers list sometime in the last two weeks. From memory, wordpress.com generate a one time guid (nonce) and then use a script to log users into their other domain(s). I guess they use redirects to achieve this.

Their code isn't released. Check the list archives it will explain how it works with slightly more detail. :)

Thanks. You happen to have a link to any of this discussion? I'd love to figure this out as I think it would make for a huge improvement to the network of sites.

http://comox.textdrive.com/pipermail/wp-hackers/2008-July/thread.html

or for a nicer view

http://www.nabble.com/Logging-a-WPMU-user-into-two-different-domains-to18417124.html#a18417124