Occult Lore by Penumbra - It has some cool concepts for other types of magic. I like Oneiromancy (Dream Magic and adventuring in dreams). I like the elementalism. The rest is something that I haven't found a way to add to my game yet.
The Shaman's Handbook by Green Ronin - Nifty spontaneous divine spell caster that interacts with the Spirit World.
Anger of Angels - Ever since I read that one, I have had this idea for a wacky Angel-based campaign. Sure, it would be high powered, but it would allow me to give my players a different take on my home-brew world.
Enchiridion of Mystic Music (PDF) by S.T. Cooley - Additional affects for bardic-type music abilities. I play a Bard, I'm sure you can see the appeal.
I am in love with Draconomicon for it's dragon concepts as well as the art. I love the picture of the blue dragon using Rebuking Breath on the wraiths, simply cool.
my favorite non dragonlance rpg book is Urban Arcana. Not just because i'm a named npc in it (thank you, Stan!), but because it's a joy to read and a font of really cool campaign ideas, like my insurance company of elemental evil concept =)