The other important part is the glaze formulation. Since the pot and the glaze are drying together, then being fire together, the glaze likes to have a good bit of clay in it. Formulating your own glazes tends to help when single firing, although I have successfully used commercial glazes with my homemade glazes.
As Jim (Offcenter) mentioned Steven Hill is well known for the technique. There is also an online group I am a member of you can join to benefit from discussions, recipe sharing, etc. There is no reason to go it alone. http://cone6pots.nin...roup/fireitonce and http://cone6pots.nin...in-the-cone-5-7
Pots were fired once for a very long time before the convenience of a bisque firing became common. Steven Hill says his reason for single firing is to reduce the lag between forming and glazing. He feels that he loses the spontaneity (sp?) with a bisque cycle in between.
I have attached some examples of my pots glazed with Steven Hill glazing techniques. With a little diligence you can find his glaze recipes, or you could buy the DVD for a lot of information.