A third Harry Potter and the Half Blood Prince TV advert has aired tonight on ABC and Fox (in the US) for the first time, and it has new scenes with our own Tom Felton! There is a continuation of the Astronomy Tower sequence, Draco (Tom Felton) being followed down a hallway, and a close-up panorama shot of Tom somewhere in Hogwarts.
As higher quality images become released, Feltbeats.com will keep you updated.
The official TV spot has not been released by the WB yet, but one enterprising fan had their camera going. Watch while you can. Thanks to Snitchseeker for finding it so quickly!
UPDATE: New high-quality version from Mugglenet.com.