A compact and well presented site of the jQuery API. Not only do they provide the function description, but offer more samples of usage over the jQuery website.

Don’t forget to check out the jQuery plugins website for some very cool things:
http://plugins.jquery.com/

API:
http://remysharp.com/jquery-api/

Check out these posts too:

  1. Even more jQuery samples
  2. Easy Drag and Drop with jQuery
  3. Create a one-time popup using jQuery
  4. Masked Input plugin for jQuery
  5. Advanced Event Timeline With PHP, CSS & jQuery
  6. Even more jQuery plugins
  7. jQuery Plugin Repository