Here's a list of links I've compiled for my DC trip:
http://del.icio.us/Violet.West/DC
I've now read all my guidebooks and made my definate short list:
1) Two main Smith museums, probably Air & Space (including the National Treasures mini-exhibit, since the History museum is closed, and To Fly at the IMAX); and the American Indian Museum.
2) Library of Congress (only open on Saturday)
3) Moonlight Monument tour on Saturday night if weather is good
4) King Lear at the Folger Shakespeare Theater on Sun. afternoon (got my tickets)
5) And, of course, the Supreme Court oral argument on Monday.
6) A nice dinner (by myself) on Friday night--possibly Komi.
My secondary list of things to do if I can fit them in:
1) Renwick Gallery for crafts
2) Duck into the Hirshhorn Museum (modern art) and see Ron Mueck's Big Man.
3) A quick visit to the National Postal Museum, because it's right close to the hotel.
4) Union Station, again because right close to the hotel.
5) Eastern Market
6) A neighborhood--Dupont Circle/Adams Morgan