Flickr MiniMeet held an event in February where a bunch of keen photographers headed to the London Transport Museum. See all their photos and the winning five that were voted by Webjam users to appear on the London Transport Museum's website.
Waterloo Action Centre has created a webjam for their commmunity-run building in Waterloo. The site provides local residents with information about what the WAC does and an opportunity to get involved.
Deviously London describe themselves as a group aimed at artists, photographers, film makers, bands and alternative sports. We love their webjam, especially their header!
Myjamfactory is a residents' association site serving the residents of a development in a little corner of SE1. As a locality-based site it has a collaborative map to allow residents to suggest sites of interest like restaurants and shops, as well as local news and weather. The associated 'Planning' page builds on the community aspect by coordinating responses to local planning issues.
A great example of how an online community enhances the activity of a 'real life' one.