Lost Symbol information on Twitter: @lostsymbol
The Washington, D.C. tourism agency has learnt from the impact that The Da Vinci Code had on tourism in Paris, London and Rosslyn Chapel - they've created a Lost Symbol section to their website, with links to some of the locations which featured in the new book from Dan Brown. I already know of most of those links, but I'm sure some readers here will find it a good resource for finding such websites as those of the Scottish Rite and the George Washington Masonic Memorial.
What would be cool is a tour done in Google Earth, which traces Langdon's route around the capital. Perhaps if I can find some time in the coming month I might give it a shot.