Create any type of chart online absolutely for FREE

I always dreamed of having Visio as a web based tool rather than a desktop tool. Now with the power that comes with Web 2.0, we have got many options to create charts, diagrams and plans completely online with no software foot print of the desktop computer. One such web software is Best4c. I agree with you that the name is weird :-), But as of now it looks like a winner application to me. Go create charts, plans, and diagrams for free @