Flash intrudes on Apple's territory to an extent with regards to applications. I don't know much about this since I have hated flash since people begun using it for flash ad banners, so I rarely use flash content aside from YouTube/Vimeo.
Flash on my uMacbook scares the hell out of it. CPU temps soar and it feels massively un-optimised.
It'll even fare worse on the iPhone and virtually any mobile device without half decent coding geared towards power saving. The GPS and 3G modules already nom a lot of power, so I am glad flash isn't happening on the iPhone. The last thing I want to see is flash ads on pc hardware websites that I visit in safari :/
At work under MoD orders, we have recently been told to ditch FF/Chrome/Opera for
security purposes and use IE8 on our XP based machines. The past week has been a truly horrifying experience browsing the web without adblock - all my pc hardware sites are littered with ads everywhere