I saw Lost In La Mancha, the documentary about Gilliam's Don Quixote, and the film did look good. Shame they kept on getting washed away by the rain!
A Gilliam produced Gormenghast film would be really worth watching -- shame he seems to have lost interest.
There was talk of a Last Express movie -- I think Jordon "Prince of Persia" Merchner penned a script, or something, but it never came to be. There was also talk of a Deus Ex movie that might also have been good.