jQuery Library for SharePoint Web Services
A jQuery library which abstracts SharePoint’s Web Services and makes them easier to use. It also includes functions which use the various Web Service operations to provide more useful (and cool) capabilities. It works entirely client side and requires no server install.
jQuery with Sharepoint – An intro to jPoint Screencast. Make sure to visit sharejpoint.com and toy around with the awesome examples.
Hiding the New Toolbar Button in SharePoint with jQuery
How to get rid of the ‘New’-Button.
SharePoint hierarchical Quick Launch replacement using jQuery
Customizable replacement of the default SharePoint Quick Launch, featuring a collapsible tree-view of the entire site collection and integrated editing, hiding and reordering.
The cool stuff comes after the 4:30 minute mark. Also make sure to check out Jan Tielens’ blog post on the SmartTools jQueryLoader for SharePoint.