I just posted the upcoming Northeastern regional events of interest to developers, but there also are some broader events coming up that you might consider:

5th Annual Microsoft Financial Services Developer Conference
April 25-26, 2007
Grand Hyatt, New York, NY
http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032318224&Culture=en-US

Mix '07
April 30th - May 2nd, 2007
Venetian Hotel, Las Vegas, NV
http://visitmix.com

Microsoft Healthcare & Life Sciences Developer Conference
May 21-22, 2007
Sheraton Atlantic City Hotel, Atlantic City, NJ
https://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032330657&culture=en-US

TechEd 2007
June 4-8, 2007
Orlando, FL
http://www.microsoft.com/events/teched2007

PDC '07
October 2-5, 2007
Los Angeles, CA
http://msdn.microsoft.com/events/pdc

-Chris