Ouch! I do believe Harry just slapped Dumbles into next year. (The rest of the Ministry got the same thing, but only into next month - primarily because they got tricked by Dumbledore.) However, those memories Harry handed off to the Wizengamot are now also in the hands of Amelia Bones, Director of Magical Law Enforcement. While ostensibly they will be used to help hunt down a certain Rat (and clear Sirius), why couldn't they be used to keep an eye on certain others revealed by those memories to have been hanging around Little Hangleton less than a year ago?