Flash is shocking on the CPU.
The basic problems of Flash CPU draining the battery and crashing the OS are what kept it off the iPad. If you look at the capabilities of the iPad and what publishers have already done (
http://www.wired.com/epicenter/2010/...demonstration/) it doesn't 'need' flash for anything.
Also most OS X crashes are from flash crashing a web browser. One of the reasons Jobs hates it.