Just in case you don't want to install Silverlight like me, you could paste the url of the video directly into mplayer. For example, you could play the first lecture with:
Chris describes this as an AI-systems class. He'll cover e.g. the theory behind expectation maximization (actually, a (good) TA did that lecture this year), but isn't afraid to talk about special casing stuff, and one reliable way to get extra credit is to implement the core algorithm correctly and then come up with performance-improving hacks based on insight into the quirks of English. This makes it a slightly unusual class; if you are actually interested in building a functional NLP product, this practicality is a good thing.
Silverlight (which is used for the videos) constantely allocated more and more memory (more than 500MB) and used about 30-50% CPU while the video was even not played (but paused) and in background.