Styling HTML forms using just CSS has some drawbacks, especially when it comes to elements and tags like radio buttons.

One way to dance around this limitation is to use a JavaScript library like jQuery to do some pretty nifty form styling. Here’s a quick list of free and good jQuery plugins to help skin HTML forms:

1. Niceforms:
   Lucian Slatineanu has an excellent script for replacing the boring default HTML form elements. It’s also very easy to customise and build your own theme. (See the Demo.)
2. jqTransform:
   Another easy-to-use script that’s good on the eye and also customisable.
3. (Functional) Pretty Forms:
   I’ve not used this before, but on first glance, it doesn’t look too hard to implement and looks minimal and slick.
4. jNice:
   jNice is nice and looks great but there doesn’t seem to be much documentation.

One major caveat: Your mileage for IE6 support may vary—don’t hold your breath. I seriously consider the job done if the scripts degrade gracefully (as Niceforms does).