I just downloaded the beta a few days ago and I absolutely love it. Many of the changes mirror some of the house rules that I already have going on in my current 3.5e game, obviously an example of great minds thinking alike... I am particularly excited by the differing sources of power that a sorcerer can choose from, it makes me want to start playing again instead of just DMing! Methinks I will preorder a copy of the core rulebook as soon as I get done posting this!