Didn't know it, but it exists
Thanks to the folks at Ardfry Imaging, I was able to test out their .CR2 thumbnailer for Windows Vista 64bit. Like a lot of people, I was waiting for Canon to come up with the software. That doesn't appear to be coming anytime soon!
There's isn't much to say other than how easy it was to install and set up. The software works like a charm.
The coolest thing is it thumbnails my .CR2 files faster than Windows thumbnails jpgs. I can't complain about that.
The software is available for .CR2, .DNG and .NEF for the 64 bit environment as well.
Get it here: http://www.ardfry.com/