I got it from Amazon: http://www.amazon.co.uk/StarTech-feet-C ... f_ee_p_t_1
I also purchased one of these, as it is neater: http://www.amazon.co.uk/gp/product/B004 ... 02_s00_i00
I've come to the conclusion that the cable is more important than it is given credit for.
Voltages are measured on TP1.
The RPi has a Sandisk 16GB usb stick in one USB port, composite output and the USB hub in the other.
Using the RPi powered from my Pluscom 7 port hub. Note that the hub has a 3.5A PSU - I've opened up the hub and found that the 5V is directly connected to all of the ports, so any port can supply up to the full 3.5A:
Startech double USB cable, both ports connected: 4.98V
Startech double USB cable, one ports connected: 4.97V
Startech single elbow USB cable: 4.91V
1.8m USB cable from my Sony Reader: 4.74V
1.2m USB cable from my ZTE blade mobile phone charger: 4.85V
I've started, so I'll finish:
ZTE Blade mobile charger with its 1.2M cable: 4.94V
ZTE Blade mobile charger with Sony 1.8M cable: 4.87V
ZTE Blade mobile charger with Startech single elbow USB cable: 5.08V
'Sainsburys' Masterplug surge-protected double USB mains adaptor with Startech single elbow USB cable: 4.79V.
I could do more combinations, but my desk is now getting a bit chaotic- I think this gives you a flavour!