I've read Good Omens, but nothing else by Neil Gaimin - I've only recently been seeing his books on the shelves (thanks to Borders, they don't seem to be stocked anywhere else!), I might just grab some of them some time. Haven't encountered Diana Wynn Jones, either.

This is good! Normally a discussion of fantasy authors results in me going "yep! got them too!". My bookshelf is straining to contain the collection at the moment, and all shelves are stacked double, so I can't even see at least half of my books!

BW