Not really, no. POD publishers maintain web sites just like other publishers, but you can order a POD book from a bookstore and bypass teh Internet completely.
Pete, you might want to take a look at Lightning Source, the printer Barbara mentioned: http://www.lightningsource.com/bookseller.html
. Click on "Participating Publishers" and scroll down to the "U" section; quite a few universities are beginning to use POD instead of traditional publishing.