A complete list of cities and a FAQ is on the website.
Doesn't work with Samsung Moment, Droid Eris, or HTC Hero
Also, "Ground clutter" will sometimes show as rain when it isn't.
Your weathermen are: Obama, Laurie, Jolie, Bruce Lee, Kutcher and Bender.
The application can use your current location to fetch the forecast or allow the user to enter a place name.
As it's name suggests this provides a simple and easy to use interface.
Forecast data is supplied from the NOAA.