What's wrong with monthly?
Meetups are usually far less busy than that, and that's been on a slow and irregular schedule. If it's too frequent, people feel less pressure to go to any particular one, and so we don't get enough people. If the numbers look good for a meetup every other month, we could think about moving to monthly.
On Sunday, January 2nd 2011 there will be a meetup the London area. As with previous meetups, the venue is Shakespeare's Head. The meeting will start at 14:00.
In order to keep us organised for 2011, I'm putting together a mailing list for LWers around the London area. If you'd like to be added to the list, please send me your e-mail address via private message.