jQuery UI 1.8 has released

1) Now use jQuery 1.4.2
2) 5 new widgets (including autocomplete)
3) 1 new effect
4) the core was reduced by 71% due to the removal of several modules from it into separate plug-ins.
5), etc. ...
Read more about the changes. And here
As always a lot of demos

Download

jQuery UI 1.8 Starter Pack contains all components and a default theme. Optimized for use with the Getting Started Guide, for beginners.
The jQuery UI 1.8 Development Bundle contains all the components and the default theme. Optimized for developers.
jQuery UI 1.8 Themes Pack Contains 21 themes
jQuery UI 1.8 Download Builder build your own

jQuery UI is now on GitHub ! :)