I moved the Win 7 machine down into the music room yesterday, and methodically began swapping out parts from my video editing/recording XP system to the newer one, taking the time after each step to assure that the system would still boot and seemed to be operating correctly.
When it came time to deal with the Delta 1010, I downloaded the most recent 64-bit Windows 7 drivers, plugged in the card and let her rip. No difficulty with the installation, and it came up in Sonar X3 without problems. I was somewhat surprised that Sonar didn't automatically run the profile routine on the 'new' card, which always seemed to happen automagically whenever I made a change in previous versions of Cakewalk recording programs.
I loaded some of the bundle files that I'd previously tried, and experienced similar results. In most cases, I would load the bundle file, and then be patient, waiting for the UI to show some life. In some cases, it still seems like it's waiting for me to select something or try to play the file before it would spring to life. I'd usually save the project as a new cwp, which, of course, means that it will start up much faster the next time around. This is far more acceptable, and makes it seem like X3 is running almost as I'd expect it to. There are still a couple of weirdnesses, though. I haven't even pinned those down, yet - either they seem a little random/not repeatable, or my aging brain isn't capable of remembering and putting the pieces together to present logically, here.
That's as far as I got yesterday, and I haven't had a chance to look at it yet, today. I haven't looked at buffers or latency settings, and have not yet tried to record anything. I've only tested playback.