Now that Terry Gilliam has made the two most disappointing films ever (for a huge Gilliam fan like myself, anyway), he will hopefully return to the kind of brilliant work that made him one of the most visionary auteurs of our time. Good Omens sounds like the right project for his comeback, and it is one that has been associated with him for some time, only to constantly be put on the back burner due to difficulties with funding. Unfortunately there are a few reasons why such an ambitious film isn't likely to be coming for awhile. Gilliam's last passion endeavor, The Man Who Killed Don Quixote, ended horribly (it wasn't finished) and his most recent big studio picture, The Brothers Grimm, was a flop. Plus, Good Omens is based on a comic fantasy novel by Terry Pratchett and Neil Gaiman, which is somewhat similar to Douglas Adams' Hitchhiker's Guide series in that most of the good parts are in the exposition, not the plot, making it less hilarious in translation to the screen. The Hitchhiker's Guide to the Galaxy, as good as it was, wasn't great like the books are. It also wasn't a huge enough hit to have financiers knocking on Gilliam's door for something similar.
Regardless, Gilliam is making the attempt again on Omens, telling the UK's Teletext, "I have struggled to find big projects that inspire me, but this book has. It's ... about the Anti-Christ and devils and angels, it's very funny and inspiring." There is already a script, likely the version by Gilliam and Tony Grisoni, and it is probably safe to say that Robin Williams and Johnny Depp remain the top choices for the casting of the two main characters, Aziraphale and Crowley.
I'm crossing my fingers that this film gets underway soon, and I'm praying that it comes out at least as great as Twelve Monkeys, if not as great as his best.