I'm using one of these http://www.maplin.co.uk/cerulian-4-port-usb-2.0-triangular-desktop-hub-513850 powered by this http://www.maplin.co.uk/low-cost-6w-multi-voltage-power-supply-226 It seems to power both the pi from one of the hubs usb sockets and a keyboard and mouse with no problems at this po...