A useful introduction to this traditional art form can be found in the illustrations and comments upon several woodblock prints in the collection of Matthew Johnson, the Kabuki for Everyone webmaster. 

By far the most impressive site examining woodblock prints is maintained by the Nagoya Broadcast Network; many prints from their large collection have been scanned with surprising fidelity, organized into useful categories and provided with brief but informative annotation. 

If you find yourself intrigued by this art form, called "ukiyo-e" (meaning "pictures of the floating world") in Japan, check out the comprehensive list maintained by Hans Olof Johansson. 

Still another recently-discovered site displays various of the traditional historical and cultural elements involved in putting together a Japanese film on the life and times of the Japanese woodblock print artist Sharaku, including not only a musuem-like exhibition of some of his prints, but also a nice introduction to the printmaking process itself. This site, too, incorporates some very nice kabuki-related photographs and sounds.