Drawter by Damian Wielgosik
is a simple tool for drawing HTML interfaces and exporting the results.
It uses jQuery and Damian's own GUI code.
You can draw HTML tags using The Tagname to draw option and the mouse.
To switch between drawing and editing content and CSS, use the Draw
Mode and Edit buttons. There are also menu items at the top of the
page -- click Code then Generate code to export your design.
also potentially a useful tool. The author of Konigi
was already blown away by it, and he's something of a web prototyping