Love jsfiddle.net, but wish you could use vim, less, and your own template? This makes it easy to set that up. It'll clone the template, open up the index.html, main.js, and main.less in vim (a la jsfiddle), and open index.html in your default browser.
makeFiddle <fiddle name> to create and open a new fiddle
openFiddle <fiddle name> to open an existing fiddle
I have this in my Dropbox/Public folder for quick fiddlin'.