iPad SDK (iPhone OS 3.2 beta) available for download
apple.com
apple.com
The developer page (http://developer.apple.com/iphone/) where the "Get Started" link takes you is still showing everything for the 3.1 SDK.
However Novell and Adobe have alternative solutions:
here is info on mono/iphone dev: http://arstechnica.com/open-source/news/2009/01/open-source-...
here is info on flash/iphone dev: http://labs.adobe.com/technologies/flashcs5/appsfor_iphone/