Wow, there's some great stuff here, including some I never expected to see like Bridge of Birds (excellent book, so are the others in the series, can't recommend it enough) and the Phoenix Guards (which as indicated is wonderfully written, funny and scathingly accurate to Dumas' style). And Something Wicked, what a great choice, Bradbury is by far my favorite author.
Trying to work in some new stuff, my list would look like this:
Dream Park: Niven and Barnes
The only truly Sci Fi/Fantasy/Mystery novel I've ever read. The sequels are very good too.
Sweet Silver Blues: Glen Cook
Already mentioned above, but Garrett sets the bar when it comes to fantasy/mystery crossovers. A great character, in a great setting that grows and evolves as the series goes on.
Fanuilh: Daniel Hood
An adventurer "inherits" a house and a familiar from a murdered wizard aquaintance. He settles down and begins to help the local constabulary in solving crimes. This series is pretty obscure, but very well done. Fantasy/mystery again.
Feet of Clay: Terry Pratchett
This specific one hasn't been on the list yet, though Pratchett naturally is. I thought this was the best of the Guards series, and maybe the best Pratchett book I've read. He's pretty consistently awesome though.
A Gathering of Heroes: Paul Edwin Zimmer
Another hidden gem, I call this the best single volume fantasy book I've ever read. Set in what could be the perfect setting to adapt to a campaign, all of Zimmer's books are fantastic. He writes swordplay like no one else, add in some excellent characters and of course that wonderful setting and you've got something special. There are other books that share the setting and some of the characters, try to track them all down.
