Animation Mentor has been producing some very cool "webinars".

The best of all is that they are recorded and everyone is allowed to watch them afterwards. Therefore, if you can't attend to it (be it by the requirement of using Windows or any other reason) you can watch (and re-watch) the presentation later.

The latest one was with the great Carlos Baena, where he gives a very good presentation on how to prepare a Demo Reel.

If you didn't know about those webinars, be sure not to miss the previous ones. =)