We’ll try to add some js scripts for nice menus. Note that some may use different libraries/frameworks.

Free Style Menu

Creating an Outlook Navigation Bar using the ListView and Accordion Controls

jQuery » SuckerFish Style

Phatfusion image menu

CSS+Javascript power. Fancy menu

Simple Javascript Accordions

How to create VISTA style toolbar with CSS

CSS Step Menu

Sexy Sliding Menu for script.aculo.us

Webber 2.0 Dock Menu Tutorial

Mootools menu with accordeon and effects

Accessible expanding and collapsing menu