I had a brief conversation with the Davis folks at the annual American Meteorological Society (AMS) meeting in San Antonio last week. They said they are readying a patch to WeatherLink version 5.7 to support the changes to DayLight Savings Time start/stop dates. I asked that the latest CWOP recommended servers be included the patch as well. I don't know if Davis has had time to test WL with Vista. The patch will be available on the Davis support site in the near future.
JasonK @ Davis presented a paper at the AMS conference on the correlation between a NWS COOP MMTS temperature sensor and the Davis Vantage Pro (version 1). I have his Powerpoint slides and will post on the CWOP wxqa.com site soon; the data looked very good.