Mobile App: Check for rain
Not only does WeatherBug give you hour-by-hour forecasts and corresponding satellite views but it also has live camera feeds from 1,600 locations around the country. On Android phones, you can set up weather widgets for specific locations; on BlackBerrys, you can upload forecasts to your calendar, so you'll know what to wear.
Cost: Free-$0.99; $4.99 for enhanced updates and maps.
Runs On: Android, BlackBerry, iPad, iPhone/iPod Touch, Palm WebOS, Symbian, Windows Mobile.