The lectures are hosted by Microsoft Research under the name Project Tuva (after the central Asian republic he was on his way to visit in 1988 before dying of cancer) and require a Silverlight plug-in to view. The project intends to offer the series free of charge to make science interesting and accessible.
More than 20 years after first seeing them, these are still some of the best science lectures I've heard. Feynman worked hard during his life to popularize science, so I'm sure he'd be thrilled that now anyone, anywhere in the world, can just click a button and experience his lectures (Gates).
We also have the three-part book series in stock at the library: