Facebook’s Science Writers group has almost 2,000 members and the group’s owner David Bradley suggested feeding in the jobs feed* to the group (hello science writers reading this on Facebook!). I think this is a great idea so am trying it out with a posting now, which should show up.
Those of you reading via Twitter, the ScicommJobs posterous blog, FriendFeed or a.n.other feed can visit the facebook group here http://facebook.com/ScienceWriters
Those of you on Facebook can see the full archive of jobs previously posted in the links at the top of the homepage here http://scicommjobs.posterous.com (each job is autoposted to @ScicommJobs)
Note that jobs are pretty varied (obviously not all science communicators are science writers).