Heh, 'tis a most enjoyable chapter. I rather loved the bit with Malfoy and it's clear that no one will ever know what really happened unless they have some means of detecting non-wanded magic. It'll be interesting to see if this encounter sparks any further actions on Malfoy's part.
The scene of Harry at home, learning steadily, though not necessarily what Dumbles would have him learn, was priceless, esp. since he's clearly got the Order's number on when he can practice wandlessly. I'm also going to be rather interested in where the other things he's learning from that book take him. Methinks he may end up going somewhere besides Hogwarts come the fall.