iPad Screencasting

Here is an article describing some iPad screencasting apps, and mentioning some others. http://chronicle.com/blogs/profhacker/ipad-screencasting-educreations-and-explain-everything/38662 
 
 http://www.educreations.com/ 	 http://www.explaineverything.com/ 	 http://itunes.apple.com/us/app/screenchomp/id442415881?mt=8