There's another B-29 undergoing restoration to flight status in Kansas... "Doc" but they are short of funding to complete it. They have a website, but it hasn't been updated since 2010.
http://www.b-29doc.com/Kermit Weeks also has one thats currently disassembled, but was flying in the 80's. (Fertile Myrtle)
Besides FiFi, that's it for possible flyers. There are actually several airframes scattered throughout the country, in Museums and on Air Bases, from pristine condition to severly corroded.
As mentioned above, The Enola Gay is in the National Air and Space Mueseum, displayed in the Udvar-Hazy center. I would love to go to see it one day, just haven't made it that far East yet. (The same museum also has the B-26 "Flak Bait", although only the nose is diplayed, the rest is in storage)
I saw Bockscar in Dayton three years ago, she's immaculate.
Anyways- the complete list of survivors is here, in the registry:
http://www.warbirdregistry.org/b29registry/b29registry.htmlCheers!