I know I should know this by now, and that the answer is probably as simple as a little Google search, so I will apologize in advance for being too lazy at the moment to do that (on my slow Blackberry), but...
I frequent www.weatherunderground.com for weather info... Is that at all related to the Weather Underground of Ayers’ association?
The founder of the weather website apparently just thought it would be cool to name the company after the communist revolutionary/'domestic terrorist' group.
From the Weather Underground (weather) website...
Company Background:
In 1991, while working under the direction of Perry Samson at the University of Michigan, PhD candidate Jeff Masters wrote a menu-based telnet interface which displayed real-time weather information around the world. By 1992, the two servers his system used were rattling off their desks as "um-weather" became the most popular service on the Internet.
In 1993, Perry and Jeff recruited Jeff Ferguson and Alan Steremberg to help build a system to bring Internet weather into K-12 classrooms. Chris Schwerzler joined Alan in his work on the Mac gopher client, "Blue Skies," which won numerous awards for its interactive imagery and text information. In the interest of expanding "Blue Skies" to other platforms, Dave Brooks, author of the Windows "WS Gopher" client, developed "Blue Skies for Windows" in 1994.
The growing Internet weather program was given the name Weather Underground, a reference to the 1960's radical group that also originated at the University of Michigan, which had taken its name from the lyrics to Bob Dylan's Subterranean Homesick Blues, "You don't need a weather man to know which way the wind blows."