I Installed windows 7 on my home dev box. So far the results have been good. Windows 7 has much better performance than Vista does. The memory foot print on my box is about 1/3 that of Vista.
I did have a couple of issues that you may want to look for, first the SM Bus Controller drivers were not installed. This was easy to fix by getting the drivers from Intel. Secondly the Performance score is a little out of touch. The overall score for my hard drive was 2.9, which was really low. The drive is a Hitachi, not a high end drive, but not a bad drive either. At any rate, I disabled write caching and reran the test. Disabling the caching resulted in a score of 5.9. Obviously some work to be done here, but it is a B1 product.
Overall my experience so far has been pretty good, if you get a chance take windows 7 for a test drive.