As I menioned in my previous post - JQuery and SharePoint 2007, SharePoint community is publishing lot of content on using jQuery. So, learn from them and start using it today. I would go further and say that its difficult to come up with a convincing reason for not using jQuery in SharePoint sites 🙂
For the sceptics, I have listed some more great posts and examples on using jQuery below:
Just think about it, Amazon, Google, IBM, Netflix, Twitter, Dell, ESPN, BBC, Intel, Oracle, Slashdot, Technorati, SalesForce, Monster, Newsgator and many more websites are using jQuery. After Microsoft announced official support to jQuery what are you waiting for? Start now and add some jQuery magic to your SharePoint sites.