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A plugin for jQuery that makes client side dynamic content templates. Kind of like PHP on the client-side. Great for making repeating content such as displaying an RSS feed pulled from an Ajax call. This is going to come in handy for sure.
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An implementation of the CSS Sprites approach to elements with changing image states that is wrapped in a jQuery plugin. Allows you to choose the transition animation between the states which is a nice enhancement from the standard CSS only version.
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Large collection of javascript tutorials around Ajax and RIA. Some are jQuery based but not the majority. Includes things such as a shopping cart, chat, RSS tickers, client-side repeaters, gCal integration, checking browser history, continuous pagination and more.
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Nice collection of various UI enhancements via jQuery plugins. Probably the most interesting are the background image switcher animation and the list box selection chaining plugins. The file tree and image cropping plugins seem useful as well.
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jQuery plugin for masking regular check boxes and radio buttons with nice graphic versions that will appear the same across browsers/OSes.