These jQuery plugins can skin SELECT lists and they have the advantage of keeping the SELECT element working as usual, which is useful when other scripts work on the element. Plus it doesn’t require extra markup and very little CSS.
Chosen
Chosen is a JavaScript plugin that makes long, unwieldy select boxes much more user-friendly. It is currently available in both jQuery and Prototype flavors.
DropKick
Creating custom dropdowns is usually a tedious process that requires a ton of extra setup time. Oftentimes lacking conveniences that native dropdowns have such as keyboard navigation.
Redesigning the Country Selector
Using principles of progressive enhancement we turn a standard drop-down into an advanced auto-complete field. This means the drop-down remains accessible, while providing a much better experience in modern browsers – handling typos, multiple spelling sequences, synonyms and prioritization.
jQuery Tokeninput
This is a jQuery plugin which allows your users to select multiple items from a predefined list, using autocompletion as they type to find each item. You may have seen a similar type of text entry when filling in the recipients field sending messages on facebook.
sexy-combo
Sexy Combo is a jQuery plugin that replaces drop downs with a more usable and style-able version then the browser default.
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jQuery-SelectBox
Traditional select elements are very difficult to style by themselves, but they are also very usable and feature rich. This plugin attempts to recreate all selectbox functionality and appearance while adding animation and stylability.
jQuery Selectbox plugin
Custom select box replacement inspired by jQuery UI source.
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formReplacer
This jQuery plugin replaces default checkboxes, selects and radioboxes with more flexible and robust counterparts.
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ws:combo
This is a JavaScript component, built on top of jQuery, used to replace the standard HTML select element with more advanced UI control.
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You forgot to include my plugin SelectBoxIt =)
http://www.selectboxit.com
Amazing you selectbox bro.