via Tomas:
A new release of the IntelliPoint software for Microsoft Mice as well as the new Vista-compatible software for the MS Fingerprint reader is available now from the MS Hardware site. These were two of the updated set of drivers I was expecting since repaving my laptop with Vista.
You can download them now (which means this mouse now works great in Vista). The IntelliType software is also there. So if you emailed me asking me for the beta drivers, you can now get them.