Peachpit Photo Club has a library of past seminars that are 1 hour to 1 1/4 hour long that you can watch for free. Even better you can download these lessons for future viewing at time that is more convenient to you (and when you may not have internet access).
You will find seminars from photographers like Syl Arenas (flash photography), Matt Kloskowski (Photoshop), Scott Kelby (Photography Q&A), David Ziser (wedding photography), and many more.
While you are there be sure to sign up for an upcoming seminar with wildlife photographer Moose Peterson to be held on March 8th.
To make these seminars an even better learning experience each one comes with an assignment for you to complete that will help reinforce what you just learned.
Can't get much better than that.
So head over to the Peachpit Photo Club and let the learning begin.