Here's one I haven't tried, but it sure sounds good.

http://www.ezrapoundcake.com/archives/3180

Also, I have been experimenting with the five minute bread recipe. At Mother's suggestion, I tried potato flakes in the basic recipe. One cup of potato flakes and 5 cups flour seems to be about right.
When you finish one batch, mix the next one in the same bowl without rinsing the bowl. The longer it sits in the fridge, the more sourdough flavor you get.