After a few months without a meeting, the Windows Server User Group are hosting an event at Microsoft's London HQ (at Cardinal Place, near Victoria Station) at 6pm on the 6th April. There will be two sessions: Microsoft's Bill Orme will present Active Directory – Rights Management Services (AD-RMS) and how it can integrate with the cloud, and Simon Veale of the Oxford Computer Group is presenting on Active Directory – Federation Services (AD-FS). The formal sessions will be followed by far less formal drinks in the Ha Ha bar afterwards.
If you're in the area, I'd suggest getting yourself along to the event. See all the details and the registration link on the Windows Server User Group site.