Fedifensor
Explorer
Well, my favorite book this year is the one several others have bashed - Tome of Battle: The Book of 9 Swords. It really breaks new ground on how to make fighters on par with clerics and wizards, a problem that has existed for a long, long time. It's not perfect, but it's just so innovative that it has to be at the top of my list.
Dragonmarked and Player's Guide to Eberron were decent suppliments, and I feel they were worth the purchase.
As to the worst...well, since I generally don't buy things if I don't feel they're worth the purchase, it's hard for me to give a good answer. However, Monster Manual IV had little appeal to me (don't we have enough monsters by now?), the Dungeon Tiles don't hold a candle to mapmaking software like Dundjinni, and if I want a card game, I can buy a deck of cards for a buck instead of shelling out a lot more for Three Dragon Ante.
Dragonmarked and Player's Guide to Eberron were decent suppliments, and I feel they were worth the purchase.
As to the worst...well, since I generally don't buy things if I don't feel they're worth the purchase, it's hard for me to give a good answer. However, Monster Manual IV had little appeal to me (don't we have enough monsters by now?), the Dungeon Tiles don't hold a candle to mapmaking software like Dundjinni, and if I want a card game, I can buy a deck of cards for a buck instead of shelling out a lot more for Three Dragon Ante.