My TV only has 1 DVI input, so a couple years ago, I bought a switchbox to share that 1 input. I bought an HDMI->DVI cable a few months back and it works fine with my 622 through the switchbox. However, will it work for the HDCP handshake, or do I have to buy a new HDTV too?
Hard to say.
There was a DVI switchbox called DVI Magic (I think it was made by a company called Spatz-Tech) that apparently took care of the HDCP handshake -- I inquired about it awhile back when I still had the 34"XBR, which was NOT HDCP compliant). I looked for it online, but it was going for several hundred dollars on eBay (its not available for retail sale in the US anymore -- not surprised since it overcomes HDCP issues; it was referred to as an HDCP Stripper.
One of the reasons I was able to convince my wife to let me sell the 34" CRT was because I kept telling her that it wasn't going to work within the year due to the stupid HDCP restrictions.
Wait... can you play a HD DVD or even just a plain old DVD player through a HDMI to DVI connector? With my old XBR, I could not use HDMI from my HD DVD player because of the HDCP issue. IF YOU CAN, you might be ok.