TarionzCousin
Second Most Angelic Devil Ever
I enjoy Monte Cook's Complete Book of Experimental Might. It's somewhat like Unearthed Arcana geared toward spellcasters.
Rappan Athuk - A great megadungeon that is fun to read and play. Beware the Dung Monster!
I cannot agree with this enough. Excellent book.I always end up mentioning the same four books any time this is mentioned.
Green Ronin's "The Book of the Righteous" is probably the best religion supplement for D&D ever written, and one of the best supplements of all time. I'd highly recommend it as a starting point for a novice DM wanting to integrate religion into his campaigns, and its a good example of what a cleric focused book should be like.
I shall hunt down the book of the righteous right away.
I didn't follow Dragonlance or Ravenloft at all in the third edition era. I still have difficulty figuring out how to do adventures in Dragonlance outside the main events.