Hey guys, I did something similar but based off the styles of the jQuery UI slider plugin. I found while these types of standalone plugins looked okay, they were frustrating to customise or even to make them look PERFECT.

Check it out here: http://taitems.github.com/UX-Lab/ToggleSwitch/index.html

I also investigated achieving something similar using only CSS base on a :checkbox, but the browser support, even in "modern" browsers was poor: http://taitems.github.com/UX-Lab/CSSInputs/index.html

Thoughts and hacks on the above, here: http://taitems.tumblr.com/post/23099016111/css3-input-stylin...