Ok Zunesters, we have released the Windows Vista compatible version of the Zune software. Go read about it at https://www.zune.net/en-us/meetzune/software.htm. Notice Windows Vista is now listed in the available operating systems. This also means it's fully supported in case something goes wrong.
One more step towards 100% pure Windows Vista across all of my machines. I figure the rest of the software world will start to catch up in earnest after we launch in January.