The jQuery UI team has been pretty busy for the past two and a half years. With more than 500 bug fixes spread over two dozen releases, they’ve been working hard to make jQuery UI as stable and flexible as possible.
jQuery UI 1.9.0 is now available with hundreds of bug fixes, a bigger and better test suite, and improved APIs. Team has updated API of some of the widgets and also introduced some new widget. You can find the complete list of what's new with this release here.
Feel free to contact me for any help related to jQuery, I will gladly help you.