I love my iPhone (3G) to bits, but their reluctance to embrace one of the most prolific web media technologies makes me boggle. Lack of Flash support is one of the things that makes me want to go with a rival next time. Not everyone can or wants to create an entire app to stream stuff. I love the Weebls Stuff website, but I can't see them releasing an app. And yes, I know the animations are on YouTube as well, but that's not the point.
I'm not even that bothered about most of the new features. I only use one thing at a time on my phone (unless you count apps and music, which this one already does) so I don't need multitasking.
And the Quattro marketing thing is a massive turn-off from OS4 too. I don't want them tracking everything I'm doing. I don't buy PC games that do targeted adverts, why would I want to have no choice in the matter on my phone?