The Noun Project strives to collect, organize and add to the symbols of the world's visual language, and to "share them in a fun and meaningful way."

They pledge to maintain a library of visual language icons that is free, simple, fun and high-quality and believe that each of these elements will help to effectively share their collection with the masses (in 13 languages). They make their library easy to navigate and find what you're looking for through a simple and clean interface with intuitive and accurate searches.

Plus, you get a little design history lesson at each icon, including the source/designer, year of creation and licensing info.

Two thoughtful observations from the Noun Project:
They "think a language that can be understood by all cultures and people is a pretty amazing thing," and their "symbols and the objects or ideas they represent are works of art worth celebrating." And, like Design.org, they also "get excited about things like scale, proportion, and shape... and are committed to design and quality" in everything they do.

Some other hand-picked posts you might enjoy on our Design Blog:

The LetterMpress iPad App: Sharing Letters with All
The Four Icon Challenge by Kyle Tezak
Fun and Nerdy Rings from the Smiling Silversmith

Via @petergenuardi