Our F# community group of the week is The San Francisco Bay Area F# Meetup Group.
I had the pleasure to meet some of the people in the group last week, at their last meetup held at Microsoft Research in Silicon Valley. Meetups are normally held in San Francisco proper.
The two organizers are Matt Harrington and Mathias Brandewinder (@brandewinder on twitter) and other contributors are Darren Platt (of Amyris Biotechnologies), Jack Fox (a major contributor to FSharpx), and Thibault Imbert (of the Adobe games group)
If you're in the Bay Area, do contribute by arranging speakers, coding dojos and tutorials.
Some details on further F# meetup groups can be found at http://fsharp.org.