Announcing Windows Live Community Builder
https://partner.live.com/communitybuilder
This is a great 'Live' release - build you own community, or take one you have already, and then offer them a suite of Live services like email, calendaring, user groups etc - for free !
This could be used by partners for customers, peer to peer groups, and partner-to-partner networking, plus many more ideas.
Let me know if you are keen to use this service - we are actively looking for some local case studies.