While I don't have anything specific to use jQuery Knobs with at the moment I can definitely see it being an extremely handy tool to have laying around. I mean, I can't even imagine the headache involved with wanting to code such interaction from scratch. The web really does seem provide in all kinds of abundance these days. I tend to work from one or two locations only but I know several people that setup shop wherever they see fit. In such cases I'd have to say that Sidekick looks like an essential kind of app to have installed as it changes your work environment settings based on geolocation. Working at the office? Settings check. Working from your favorite coffee shop? Alternate settings in place! And even if you don't work from multiple locations, the site is very kind on the eyes and fun to scroll through.