The new LED ones with a black border, glossy screen, built in camera etc require displayport/thunderbolt. The older silver matte screen ones have a regular DVI port, and I switch mine back and forth between my mac and PC with a KVM switch and it works great.
Checke with my local distributor, they've got the Mac Cinema display (glossy) and the Thunderbolt display. So you are saying that the Cinema display (gloss) won't work for the PC? The gloss version has been out since 2010, if the reviews are any indication.
Boot Camp is for running Windows on Macs. The matte display is not available anymore. The Thunderbolt display does not work with PC's (yet perhaps). However, the non thunderbolt display http://store.apple.com/us/product/MC007LL/A/apple-led-cinema-display-(27%22-flat-panel) is still for sale. It uses mini displayport and there are adapters for sale that will convert dual link DVI to mini displayport. Just google DVI to mini displayport.