I'm a big fan of woodworking schools. Watching a master woodworker show his or her techniques in person where you can ask questions and where they can look over your shoulder and tweak your actions has proven to be invaluable in improving my skills.
And just as soon as I hit the lottery, I plan to become a full-time ww student.
If you've had good experiences at woodworking schools, I'd like to hear your thoughts and recommendations.
Note added 2.24.09: Links to all of your recommendations can be found on the links page in the side bar.
*I wasn't so sure I'd like chip carving, but was proven wrong. Plus, I learned another way to sharpen.
The photo above is a cherry plate I turned in class yesterday (without finish) and a poplar lidded box I turned in class last week.