There is a discussion about typography and design for iPad apps started (I suppose) from a post on the website of Information Architects about the Wired app (http://informationarchitects.jp/wired-on-ipad-just-like-a-paper-tiger/)
Related links:
http://ministryoftype.co.uk/words/article/the_wired_app/
http://www.flickr.com/photos/formforce/4647760506/

Ideas, opinions?