A small group of electrical engineers from Toronto, Canada, are creating an collaborative editor for drawing circuit schematics. Upverter runs entirely in-browser (no need to download and install any programs), and will allow users to work on a schematic at the same time as other users. While you can’t perform any simulations on the schematics within the editor, it is very useful for prototyping and sharing your ideas. If that sounds interesting to you, go to http://upverter.com/ and sign up for a free account to try out the Beta.
For a slightly more in-depth explanation and a video interview with one of the creators, check out this IEEE Spectrum article: