No problem ^^

Article from the link Ginny posted:

Another big movie shoot has come to town, just in time for the cherry blossoms and thunderstorms -- and unlike most recent Hollywood visitors, this team plans to stick around for a while.

"National Treasure: Book of Secrets" -- a sequel to Nicolas Cage's 2004 blockbuster Archives thriller -- set up shop yesterday and will be here until April 16, shooting at classic postcard-Washington vistas including the Mall, the Library of Congress and Georgetown. The plot has something to with missing pages from John Wilkes Booth's diary. If you see the Oscar-winning "Ghost Rider" around town, send the deets to reliablesource@washpost.com.

It's unclear which of Cage's co-stars (Diane Kruger, Jon Voight, Harvey Keitel) will also be here, but District officials are thrilled with the length of the shoot -- the longest D.C. stay for a major movie since Nicole Kidman and Daniel Craig descended for an epic six weeks in the fall of '05. That flick, "The Invasion" (originally titled "The Visiting"), is due out this summer.

-- Edited by Loew at 20:01, 2007-03-28

Muffin is in Washington as I just read...here http://www.washingtonpost.com/wp-dyn/content/article/2007/03/26/AR2007032602367.html

He probably is preparing....since I think there would be something out by now about him if he wasn't

National Treasure II has supposedly started filming bits here and there.  Maybe he's preparing for his role?