There are a couple of rumours going the rounds of the internet at the moment of the long-promised adaptation of the book coming to fruition. Though probably as a 4-part adaptation for TV.
I'm never too sure about book adaptations, but I guess if it's a good one and encourages people to read either Terry Pratchett's or Neil Gaiman's books it'll be a good thing.
Links here:
www.bleedingcool.com/2011/02/08/terry-jones-adapting-good-omens-into-a-tv-series/
secretpassagesbooks.com/?p=792
I know I have a copy of Good Omens here, so I must find it to re-read.
(I have an Excel spreadsheet with all our books and their locations - trouble is, I have to first find where the heck I saved that on my computer.
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