DrawAnywhere

DrawAnywhere is an online diagramming website, where you can draw, modify and share flowcharts and other diagrams, with the look & feel of a desktop application. It runs on any browser with Flash 9 installed. There is no need to download and install any custom software. It runs entirely on the web, and thus it is an always-on-access-anywhere solution. It meets all your diagramming needs without installing, maintaining and purchasing expensive software.

http://drawanywhere.com/