Tabbed Interface

Tabs... they're everywhere now. People know and love them, but creating them yourself can be a pain. Thankfully, jQuery UI has a simple and easy to use function to create them from an unordered list and a set of DIV's. The implementation is very quick and provides a sleek-looking interface by default, which can be styled by CSS to pretty much any look you want.

Cycling through multiple functions

Sometimes you may want to click an item and cycle between 2 (or more) different functions - for instance first show, then hide another item.  This may be for building a custom navigation, displaying additional options, or any other scenario where you want to have an on/off type of functionality.