I'm a little surprised that so many people are mixing 3.0 (Tome and Blood, etc) with the 3.5 rules... Is there a thread around or something that discusses this? For instance, some of the 3.0 PrC's have been updated in the 3.5 books (DMG, Complete Warrior) and are substantially different (mostly less benefits). And I don't think the Book of Spells (3.5?) includes spells from the T&B, S&S, etc books...
I'm interested because I just got started a few months ago, and I bought several 3.0 supplements, and then found out they seem to be over-generous compared to the 3.5 stuff