This patch: http://support.microsoft.com/kb/912945, SUCKS.
Avoid it if you can! Seriously, we make heavy use of flash, acrobat and other ActiveX controls, including the ones built into Sharepoint, and they are all toast practically! Now all of our users have to click on the stupid control before they can use it. There is a good work around for embedding flash onto pages with some javascript here: http://www.texaswebdevelopers.com/click-to-activate-and-use-this-control.asp
Also, it appears the Sharepoint content editor rich text control is broken totally with this patch installed. I have only tested on a few machines, so I can't be totally sure.