A major part of the cloud computing offering from Microsoft is BPOS: off premise Exchange, SharePoint and LiveMeeting. I hosted a panel of BPOS experts at TechEd, where they talked about the migration and implementation of BPOS, and took some questions live from Twitter.
Check this out at: http://edge.technet.com/Media/BPOS-Business-Productivity-Online-Standard-at-Live-at-TechEd/
Cheers,
Anderson Patricio
http://blogs.msexchange.org/patricio
Twitter: @apatricio