The second half of March, Jobs said 60 or 80 days after the keynote if I'm not mistaken... (should be easy to verify) The keynote was held the 27th of Jan.
http://www.apple.com/ipad/notify-me/
Apple Tablet PC
IPAd - with administrator's rights
Just sold in USA and someone can already install what he wants
http://www.youtube.com/watch?v=dgHNayVt ... r_embedded#
http://www.youtube.com/watch?v=dgHNayVt ... r_embedded#