bassplaying.com where bass guitar takes center stage

This could just as easily go under "technique," but I'm putting it here under theory. Here are a few vids that cover ii-V changes on bass. Two of the vids are demonstrated on upright bass, but you can still get the idea:

http://playjazznow.com/bassist_vid.html

These are from the PlayJazzNow folks, who make some nice play-along mp3s.

Wheat