Meteosmit is a nice weather Google Map for Italy that displays the latest weather forecasts.
The initial view of the map gives an overall view of current conditions across the country but it is possible to select a region to zoom in and get a more localised forecast.
Above the map is a slider control that allows you to get forecasts for the next few days. Below the map you can select to view the temperature, wind speed and directions and air pressure.
Mapperz informs me that there is some very clever stuff going on under the hood in Meteosmit with OpenLayers and PostGIS that help make the map work.