There is a show on PBS in New York (Ch. 13) called Treasures of New York. I taped an episode when I wasn't home over the weekend which was called Art Underground (art in the subways). It touches on not only the original tile work throughout the original lines, but much of the newer tile work as well as other forms of art (e.g. glass and metal work). The film was done a couple of years ago, so it doesn't include any of the work on the new Second Avenue line, but they cover some amazing work. I almost wish I was still working in the city so I could visit some of the covered stations... well, maybe not working!!!
I think it is well worth a watch - it runs just under an hour. Here is a link to an online version:
