I finally made time to set up all the SB-20 etc. It has certainly made a difference to my portrait lighting ability.
Here is the drawn layout:

and the photo of the real layout:

The description:
The background is a Tim West Polarizer Blue muslin - I set it up 6 feet wide. The background lights are two Nikon SB-20's set about 3.5 feet out from the background and pointed at the centre, They are set to Tele on the lens and at 1/16 power, 4' off the ground. One triggered by a Wein Peanut slave, the other by a Vivitar SL-2 slave.
The hair light is a Sunpack Auto 30dx at 1/16 power with a spaghetti box as a snoot - with a 1 stop ND gel inserted into the box. About 1 foot from the backdrop and 6 feet high - triggered my a Sonia brand slave.
The main light is a Vivitar 285 at 1/4 power, triggered by a Wein peanut slave. Shot into a 43" photoflex umbrella about 7.5 from the background, and a foot in from the edge of the background.
The subject / stool is about 5 feet from the background, and I was about 5 feet away from the subject. Shooting a Canon 20D, Tamron 17-50 f2.8 @ usually the 50mm FL, with a 580ex on camera set at 1/64 power to provide a little fill and trigger the flashes. Camera set a ISO200 and 1/125 sec. and f/8.
I have one unused Nikon SB-20 which I can setup in a dual flash bracket I made to use with my 48" umbrella:


I did not use the dual flash today....
And now a couple of results!


I am happy! I just need to get 2 more slaves, one as a backup and one I have seems flakey. ALso a couple more little PC cables, and I should be set!