i don't know if a weather app is a real "killer-app", but there seems to be something interesting about this subject.

now we have a new App in the OVI Store from Weatherbug:

Standard Features:

- Access to the WeatherBug Network — the source for truly live, local weather with the largest network of professional weather stations in the U.S. and thousands of locations around the world

    -  Extended 7-Day, Detailed and Hourly* forecasts

    -  Ten (10) detailed interactive weather maps: Temperature, Radar*, Satellite, Humidity, Pressure, Wind Speed, Today's High, Today's Low, Tomorrow's High and Tomorrow's Low Temperature Forecast

    -  Interactive weather maps include zoom and road, aerial or hybrid view options

    -  Radar animation*

    -  Easily switch between unlimited saved locations

    -  Severe weather alerts (NWS alerts) for any saved location*    -  [Note: Alerts update in background at interval options of 15 minutes to 8 hours.] National Weather Outlook broadcast provided by WeatherBug meteorologists* (updated 2x daily)

    -  Weather camera images and time-lapse animation*

    -  Unique weather data presentation for your location – view maps, radar animation, camera images and videos in full-screen mode or side-by-side current conditions>

    -  View weather in Metric or English Imperial (U.S.) units

* U.S. locations only

and here is a little video about it:

source: youtube/weatherbug

thanks to thenokiareview for the hint :-)

UPDATE [07.06.2010]:

this app is available in OVI Store for free :-)