I’ve discovered a nice set of jQuery filter selectors.
Take this example of selecting the checked radio button in a group
![image image](./image.axd?picture=image_thumb_109.png)
Markup
![image image](./image.axd?picture=image_thumb_110.png)
Script
![image image](./image.axd?picture=image_thumb_111.png)
There are many many others, e.g. @contains, :disabled, :not(selector), :parent, :password, etc etc, more info in jQuery docs.