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Iconfinder is a search engine for (you guessed it) icons. It’s a great source for graphic designers to get inspiration or even download icons for commercial use. A search for “music” yielded 12 pages of results, the first of which is displayed below.
The site’s functionality is fairly basic but does allow you to change the color behind the icons to see how they work on multiple backgrounds, filter by the type of license, and filter by size.
Personas is an amazing web app (with a Flex front end) that scours the internet for information based on a person’s name and builds a profile of how they are perceived online through natural language search. Since the application has no idea how to separate the list of people who share your name, it gives you an interesting view of the overall perception of your name, as opposed to you as an individual. The interface is clean, nice looking and you get to see the gears turning as it computes your profile.
Tin Eye is a new type of image search that returns results based on the visual characteristics of an image instead of how you describe it using keywords. Don’t search for the word tree, upload an image (or paste the url) of a tree and Tin Eye collects similar images for you.