JH and I went down to check out Jim Henson's Fantastic World at the Smithsonian. It was a nice exhibit, though as usual, no photography allowed, so there will be no pictures from it.
The focus on this exhibit is the original sketches and artwork that Jim Henson would create while he was coming up with his ideas. Also explained were the origins of some of the muppets he came up with. I had no idea that Cookie Monster was actually based on a monster Henson had used years ago for a commercial. There's also an explanation of how Big Bird is controlled (yes there's someone in there!), original items from The Dark Crystal, and clips from some of Henson's commercials and short films. Of course some of the muppets are also on display.
It's a good exhibit, but not huge, so make it part of a day out at the National Mall rather than the only thing you plan to go see. It's only here until October 5, so you'd better see it now. Of course, I expect Kermit will be returned to the American History Museum when it opens back up (November 21!).