One of my favorite demos at Disrupt NYC was from an education startup called Desmos that is reinventing the whiteboard to make it browser-based and interactive (watch their Disrupt video below). One of the killer features of the Desmos Whiteboard is an interactive calculator that graphs equations as you write them. (Founder Eli Luberoff was a double math and physics major at Yale). Desmos has now taken that and rewritten it as a standalone online graphing calculator. It instantly draws the equations as you update them, it's free, browser-based, color-coded, and you can share any graph with a bitly link. 
Source: http://feedproxy.google.com/~r/Techcrunch/~3/PdfuqD5ewTE/
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