The update is a laugh, i've had pretty much all those features through my jailbreak, and they're are better. if the idea of Backgrounder with multitasking were mixed it wpuld be better.
Apple was just playing catchup to the hackers with this update. Maybe to make way for iAds? I can ser their point, give users more reason to use an official OS image with the most used hacked features, then msybe they'd use it rather than jailbreaking?
and stuff, Apple said the 3G / iPod 2nd gen won't have most of the OS4 features, perhaps that is one of them? multitasking was defiantly one of them. "they don't support it" - i'd say more of a "we want to make people finally upgrade" which Steve said would be "nice".