Via Pam's monthly newsletter:

I have room for about ten more members of FlashFiction-W, my free online workshop for writers of flash fiction. If you'd like to join us, send a blank subject header message to listserv@listserv.uta.edu and in the message section write only this:

Subscribe FlashFiction-W j.jones@email.com James Jones

(using your own email address and your real name). Shortly thereafter you'll be contacted about joining the workshop.