Take your pick from the Londonist's London for Free Map

Here's a useful tool, courtesy of those clever sorts over at the Londonist. You can also click on their logo below to visit their excellent site. It's a map of a whole bunch places where you can find free events at galleries, theatres and attractions in London all laid out on Google Maps.

Surely that's well worth a look. Click on the map below and it should open in a new window (albeit slowly).