As everybody know, SharePoint controls are difficult to work with. One advantage is jQuery allows you to easily work with the DOM and manipulate controls and styles. I am beefing up on the technology, so I bought a book, “jQuery: Novice to Ninja”. I do not recommend it.
Today, I used jQuery to build cascading drop down software because some yo-yo bought the wrong Bamboo web part (Lookup Selector). It took me about 1 hour! Easy peasy.
I am taking SharePoint .net programming next week at Learning Tree.
More info http://blogs.technet.com/vedant/archive/2009/02/08/jquery-and-sharepoint-2007.aspx