Here is official Federal Holiday Government calendar
http://www.opm.gov/operating_status_...edhol/2010.asp
Memorial Day 2010 will be Monday May 31st 2010
Unfortunately it is one of the US holidays which as been made a floating holiday to always fall on a Monday. It is always celebrated on the last Monday of May.
Interestingly they have left Veterans Day as always being November 11th.