Eldritch Sorcery

Eldritch Sorcery is exactly what it says it is: a giant book of spells. This book contains hundreds of new spells for all of the core d20 spell casting classes, plus Assassins and Blackguards. I was impressed with the number and variety of spells available. There's a heavy emphasis on Evocation, Necromancy and Transmutation, but all of the schools are well represented. Illusion is the only school that seems to have gotten the short end of the stick. The book is well laid out and very text dense. Unlike most d20 sourcebooks, Eldritch Sorcery contains no new Prestige Classes and only a handful of new Feats. This is a huge plus for me.