Flash Player 9 April 2008 Security Update
Adobe released a security update for Flash Player 9 (Flash Player 9,0,124,0) on April 8, 2008, to strengthen the security of Adobe Flash Player. If you work with SWF content, you are strongly advised to review the article, Understanding Flash Player 9 April 2008 Security Update compatibility, to determine if your SWF content will be impacted -- and to begin implementing necessary changes immediately to help ensure a seamless transition.
Please comment (nicely ;-) if there are any issues unaddressed in this article and I'll forward it to the Flash Player team so they can follow up and update this article.