Just when playing with my mobile on my way to work on Friday I happen to browse by the google code playground for the first time. And I was thrilled.
Google had compiled an interface where we can play and test with different apis and see the results in real time. An awesome live action.
Jquery UI is an awesome extension and I love it. Most recently I had to use it in one of my project and everything went well until client wanted to add sliding functionality in mobile devices.