Great beginning! Can't wait to see where this goes. My beiggest hope for it, beyond the obvious one of taking down Bumbledork, is that he and his allies finally get Sirius free of both the Ministry's and Dumbles control so that Harry never has to answer to the MOB again. Hurry with more!
(If for no other reason than the damned theme song from the movie won't stop playing in a loop in my head. I've always hated all that whistleing.)