Perhaps this can help someone else.
I followed this guide when I got my first cube, and found it easy to set up. (I actually read the entire thread!)
I did one thing differently, however, and rather than the recommended Corsair PSU, I tried to save a few bucks by buying this one instead:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817171084 (Cooler Master 700w)
On the spec sheet, it looks like it should work - 55 amps on the 12 volt rail.
It runs one cube, at high clock speed, and seems to do it pretty well.
My 2nd cube arrived today.
Short version: That Cooler Master power supply will not even start up 2 cubes at high speed, and with both cubes at low speed they will start up and run for for about three minutes, before the psu shuts down.
I found a Corsair CX750m at a local store. I've been running both, at high clock speed, for a couple hours now.
In short, don't try to cheap out like I did. Pay the extra $10 or so for the Corsair. It seems worth it.
Additionally, I found a Dell Latitude X1 in my "I don't use these but don't want to throw them out" stuff. It's running 2 copies of the slush proxy (one per cube) on 13 watts when the screen is blanked. It's running Windows XP, and peaking at about 70% utilization on the cpu.
If I find any issues with either of these setups, I'll post more information.
In the meantime, however, my thanks to all who have participated in this thread and contributed to the information that makes it so easy to get one running.
'snail