MSN UK have a feature on their front page about Blockbusters that might have been, and, well, you'll never guess which film they did a mini mock-poster for...
Terry Gilliam’s Good Omens
Terry Pratchett and Neil Gaiman were delighted to learn Terry Gilliam wanted to tackle their apocalypto-comic fantasy. Then Gilliam’s funding curse hit, with the film stuck in purgatory. And that’s even with announcements back in 2002 that Johnny Depp and Robin Williams had been offered the lead roles.
......
Yeah, that's all they wrote about it. Still, I thought it was a pretty good advert for our beloved book. (Even with Robin Williams as Aziraphale. *shudder*.)