Edit: it has keyboard support indeed. I've just tried and works perfect. Pressing space switches the checkbox state and tab switches between checkboxes.

It's a pretty damn good job.

<s>I bet it's not too dificult to add keyboard support to them</s>

Non-obvious keyboard support is still almost worthless.

I'm sure we'll add a focus highlight or something soon!

It would be nice to add a yellow/someothercolor border or change the colors to a darker blue...

You use Prototype on your iPhone sites? I’ve tried to avoid using libraries on mobile sites as they add a fair chunk of download and processing overhead.

Actually, it’d be nice to see a Webkit specific (or at least modern browser specific) JS library that dumps IE workarounds and fallback DOM selection routines; leaves us with syntactic sugar for QuerySelector and XMLHTTPRequest, and an animation library.

Most of the code in jQuery is not to work around IE, it's for features you actually want. So I doubt this would buy you much savings, especially when gzipped.