First, congrats to all the GGJammers! Looking forward to playing a bunch of cool new games. So yeah V0.5 Beta of the HTML5 tile map editor is now online. This version adds the following features

• Map Zoom. Yeah we got zoom!!
• Right button erase (reset to tile index 0).
• URL API.
• Small UI rendering fixes.

More info here http://callidusrex.com/?p=101