I had a brief play around with the example, and pretty quickly came across bugs and unimplemented commands (for example: 'b', 'e' and 'O' are missing, but 'o' acts like 'O'). I like the way the cursor changes colour to hint at the current mode.<p>However, what I'd <i>really</i> love would be a bookmarklet I could click to Vi-ify every <textarea> on the current page. I've got "It's All Text" set up in Firefox to open <textearea>s in gvim, but it's still clunkier than editing right there in the page.