I don't see why this would not work on a PC too. Thunderbolt (aka Light Peak) is not an Apple tech, they are just really pushing it adding it as standard rather than (or so it seems) USB 3.0 just to be "different" as usual.
It is an Intel tech and should also be available for PCs.
It looks like Intel are pushing it as motherboard only, i.e. not endorsing add-in boards, but that could of course change. Boards should appear soon I would think.