DigiWx, from Belfort Instrument, has a web site up that shows the location of DigiWx weather stations across the U.S. Click on a marker and a small window pops up with airport details (Airport name and FAA identifier, city, state, latitude and longitude). Weather stations with an online web site have green markers.
An extra added feature is current METARS from the weather stations that have an online web site is shown below the Google map. The METARS rotate through each station, showing each airport's METAR for about 10 seconds.