OpenStreetMap is an editable map of the whole world, which is being built largely from scratch, and released with an open content license. It's a global project but it started here in London. If you want to find out more about using or contributing, these meet-ups are a great opportunity to do so. We love to welcome new faces. Apart from that, it's a friendly social pub gathering for the London OpenStreetMap community.
Lots more event details on the OpenStreetMap website
Official Website: http://wiki.openstreetmap.org/wiki/London/Winter_2010-2011_Pub_Meetup
Added by Harry Wood on January 3, 2011