Street Sensation is posting photographs of every street in central London. It's added links to relevant websites for 3,500 businesses and tourist attractions.
The comprehensiveness can blow you away. Pick a neighborhood you want to visit and then get yourself situated visually. Combine this with a satellite tour via Flickr's world maps or Google Earth's satellite views, and you've got a handful of fun planning tools.
One flaw: We wish they had some way to highlight the coolest places, or maybe let you mark them and add notes. For now, you have to pay about $8 for a printable map.
EARLIER: London: Cheap Sights, Eats, & Sleeps.