Squareleaf – Simple and Intuitive Virtual Whiteboard
http://www.squareleaf.net/

Squareleaf is a simple and intuitive virtual whiteboard, complete with all the sticky notes you’ll ever need. Unlike the real thing, their notes don’t fall off all of the time. Squareleaf doesn’t force you to keep boring old tabular lists. Arrange your notes how you see fit, quickly and easily. Remember important things, keep to-do lists, organise projects, track work and everything else that you need to do that we’ve never thought of … and its free. Coming soon will be a Pro version with even more cool features and stuff. Not too many though, just enough and no more. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.