If you can get a reasonably priced RGB capture card (the only ones I can find are about £200), you could, theoretically I suppose, use an HD-Fury with a VGA to RGB adapter.
An HD-Fury can take the output from a DVI digital source and convert it to VGA analogue. It's primary purpose is to enable you to connect a PC to an HD compatible TV/Monitor, making it fully HD-Ready, complete with HDCP. I believe an HDMI to VGA version is now available, but if not you can use a HDMI to DVI cable.