I played all of these 'cept the dreamcast/PC ones. Though I did play Grim Fandango at a friends house and I loved Skullmonkeys, the sequel to the Neverhood.
The demo was indeed very fun, however, the fact that it's only 6 hours or so might put me off getting it just yet. It's for the same reason I haven't bought CoD:WaW yet. I only have so much money, and I want a game that's going to last.
Would it have been so difficult for you to give the name of each book so that we could simply check the library to see which ones we have/don't have?