The official jQuery blog has announced the availability of jQuery 1.3b1. They're asking for testers to iron out remaining bugs - looking to release on January 14th.

Major changes include:

• Selector Engine - The selector code has undergone a complete rewrite - it’s likely that some edge cases still exist here.
• DOM Manipulation (append/prepend/before/after) - This code has also undergone a large rewrite along with some of the logic for executing inline script elements.
• .offset() - Another method that has been completely rewritten.
• Event Namespaces - The logic for handling namespaced events has been completely rewritten.
• Event Triggering - When triggering an event the event now bubbles up the DOM - this is likely to cause some problems.

Go lend a hand!

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2. jQuery 1.3.1 Go For Launch
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4. jQuery 1.4 Alpha 1 Released
5. jQuery 1.4 Released