And really good and cheap Android pads are soon to be released (in March)

http://timesnewsworld.com/073127/android-3-0-eee-pad-memo-tablet-from-asus/

http://thetechjournal.com/electronics/tablet/asus-android-eee-pad.xhtml

The good thing about these Android pads are that they are cheaper and applications are not controlled
by, what has become, Big Brother Apple.

One of my favourite iPad apps for learning about the Solar System

http://itunes.apple.com/us/app/solar-system-for-ipad/id406795422?mt=8

A web page with good examples of iPad apps for education and productivity

http://www.ipadineducation.co.uk/iPad_in_Education/Welcome.html