Wiki in 80 lines of Javascript

I want to share this hack I wrote over the weekend - an 80-line web app as a demo for my Pageforest JavaScript-based web app service. Click on edit above to see the markup for this document and edit it. Your changes will be reflected in real-time in the preview section, below. You can save a copy of your edits by clicking Sign In and then Save, above (you'll need to create a (FREE) Pageforest