The latest issue of Shop notes (one of my favorite ww magazines) has a tutorial on how to cut dove tails with a table saw. I believe you get a free preview on thier web site www.shopnotes.com . It lookes easy enough and the only thing that you realy need is to have you blade reground to keep the bottom of the dovetails flat. It's in Vol 18 issue 108.
I would have poisted this under tip but alas I can't post on that section of the forum.