The app seems to have been taken off?
It was also the third app in Top Free list on iPad, but gone now. I'd checked both of the following before posting, and both worked:
US: http://itunes.apple.com/us/app/skype-for-ipad/id442012681?mt...
New Zealand: http://itunes.apple.com/nz/app/skype-for-ipad/id442012681?mt...
Maybe they'd released accidentally?
UPDATE: Yes, Skype pulled it: http://twitter.com/#!/Skype/status/98253150229757953