I've used http://www.audionics.co.uk/products/emu.htm
but for new installs I'm looking at http://web2.raritan.adxstudio.com/products/power-management/Dominion-PX/DPCR20A-32/ for the per port power consumption data, increasingly important with UK colo power price increases I'm not a fan of zero U devices unless you get racks they're designed for as they get in the way of other cabling and server rails (protruding parts seem to be common with some manufacturers rails) and make any work risky brandon
