The latest release of the Atlas Control Toolkit has been released...
You can download and see the demo's here
Check out the updatepanelanimation here there is also an animation extender to show panels etc with a zoom, fade etc.
Scott Gu has a great post (as expected!) here
They have a nice little slider control for selecting ranges, it looks pretty cool. Another one that caught my eye is the 'NoBot' control which is like an invisible captcha.....worth a look :-)