Phyzome threw together a mailing list in May of the people who came to
the East Coast meetup in DC, to discuss a potential US Wikimedia
chapter. If you are interested in the subject, don't worry, you
haven't missed anything; there have only been one or two posts to the
list so far.
There is now a public mailing list, WikimediaUS-l, for these
discussions. You can sign up here:
http://mail.wikipedia.org/mailman/listinfo/wikimediaus-l
Cheers,
SJ