Google Maps Weather Overlay

Google Maps has several different mapplets that can be added to maps including time zones, demographic information, and elevation contours.  One useful mapplet was created by The Weather Channel and allows users to overlay information about current weather on their maps.  This information includes temperature, wind speed, dew point, sky conditions, humidity, and pressure.  Users can also view current radar images on their maps.

This mapplet can be found by logging into Google Maps, then clicking on the "Browse the Directory" link.  It is also available in Google Earth.