Client side scripting libraries - RIA

While surfing over the internet I came across couple of excellent lightweight open source client side libraries. These libraries make Rich Internet Application (RIA) development look so easy and powerful.

http://jqueryui.com/
http://www.extjs.com/

The significant advantages include:
- Abstraction of lower lever javascript complexities
- Good effects
- Excellent themes

Microsoft decides to ship JQuery with Visual Studio
For more details visit ...
http://weblogs.asp.net/scottgu/archive/2008/09/28/jquery-and-microsoft.aspx