The Librarian of Congress and more
With the new features in Flash CS3 for captioning, the skins we've made available for accessible video presentations, our support for the DFXP caption data format, and new work on CC for Flash by NCAM I'm seeing a lot of new captioning examples. Someday there will be too many to point out when new ones come available, but in the meantime, here's another. This one is also by the Library of Congress and relates to the 2007 National Book Festival and uses the FLVPlayback skins.
The example is at http://www.loc.gov/bookfest/. It includes captions and is screen reader and keyboard accessible, and also offers a transcript.