Sang Shin from Sun Microsystems offers a 10-week online course on AJAX programming. The course started on august 4th but you may still register here. The material provided is of great quality. The course description says:

What is it  like to take this course online? 

• Online attendees of this course are expected to do the course work as following
  
• Read the pre-class reading material at the convenient time of their choice - the dates are specified only as a guideline
  
• Read the presentation slides (with speaker noted version if you want) at the convenient time of their choice
• Do the weekly homework - the due date of all homework’s is two weeks after the final class so you have plenty of time to finish them
  
• Participate in class email alias or wiki forums for asking and answering questions or starting discussions
  
• At this time, I don’t have any plan (nor resource) to offer real-time webcasting.  I am planning to provide flash and quicktime version of the presentation and hands-on labs.

More information here.