Mists of Avalon and Firebrand by Marion Zimmer Bradley.
Artefact of Power (4 books) series by Maggie Furey
Nightrunner series (3 books to date) and Tamir Trilogy (3 books) by Lynn Flewelling
Hitchhikker's Guide to the Galaxy (4 or 5 books, depends if you read Mostly Harmless or not) by Douglas Adams