Useless JS library #1 ready:
A paned-tabbed js grid, where cells can be iframes because every grid operation only changes the css and the cell itself is never moved in the DOM. The purpose is to support complete sandboxing of untrusted snippets, so we could even let users pick their own modules if they want extra functionality.

Soon I'll clean up both this and the messaging and put them on github, but to me writing these is a creative process and the working prototype is everything but readable.

In the meantime I put it on
http://test.tardigrade.dynu.com