The Noun Project is a website devoted to cataloging and fostering a design community focused on creating a visual language (in the form of simplistic icons and symbols) for commonly used terms and nouns. Obviously The Noun Project is building upon a rich legacy formed by AIGA, The National Park Service and more, but they need your help. To expand the website into a fully functional, searchable database they have a created a Kickstarter project in the hopes of raising enough funds to see this tool really come to life.
I think this is a fantastic project and I look forward to really seeing their vision become reality. A one-stop resource like this, to download free, high-quality icons and symbols is an invaluable tool for designers, architects and artists.