The Visual Dictionary

http://thevisualdictionary.net/
"The Visual Dictionary is a collection of words in the real world. Photographs of signage, graffiti, advertising, tattoos, you name it, we're trying to catalogue it.

We started the project in February 2006, and have since racked up over 5000 images of over 3000 words - thanks to everyone who has contributed to date. We're of course, still accepting entries, as the Dictionary should just continue growing forever, but we're starting to think about ways of navigating and browsing images now.

If you want to join in, why not sign up and contribute images, or drop us a line with your ideas of how we could use the images. We're open to suggestions! We'll be releasing a proper API soon so you can develop your own solutions too!"
http://thevisualdictionary.net/twitter/