This interview with Cory Doctorow, main man behind the widely read blog BoingBoing mentioned these great London resouces...:
http://www.hotspotted.com/
Hotspotted helps people connect to the internet in the places they want to.
http://www.streetsensation.co.uk/
London's favourite streets. Entire streetscapes showing over 2,750 shops, bars and restaurants in the liveliest areas of London.