Association for Software Testing's Black Box Software Testing Series of classes. I enjoy doing this, and I've primarily been focused on teaching the Foundations class over the past year. This year I made a commitment to take Bug Advocacy and get involve with teaching it as well.
Starting Sunday, May 15th, 2011, another round of Bug Advocacy will begin, and there's still time to sign up if you want to participate. Prerequisite is that you have to have completed the BBST Foundations class, so if you've done that, you're eligible. Also, while Foundations is Free to all AST members, Bug Advocacy costs $200. Still, with a month of focused interaction and assistance by coaches and instructors, that's really a great deal (it's way less expensive than other trainings of its type, and I'd dare say you'll likely get lots more out of it... but hey, I'm a little biased :) ).
To borrow from the Association for Software Testing's main site:
So seriously, if you are looking for an infusion for your testing skills and approach to testing, definitely consider taking this upcoming class. I'd love to see you there :).