Apple released an OS X update today (10.4.9) which among several bug fixes also includes Flash Player 9.0.28. This means that anyone on a Mac who installs the update -- which I am assuming will be most users since it automatically prompts you as soon as you reboot your machine -- will automatically have the latest version of the Flash Player installed.
IMO this is huge because it will have a significant push on the adoption rate numbers, and will continue the push of Flex as a significant development platform.
Hey Adobe, think Microsoft will go for something like this in one of their monthly updates? Wishful thinking anyways...
I first read this on John Dowdell's blog, who works for Adobe.