New hack fixes the irritating aspect of Mac OSX that if you click on a background window, the window may react to the click as well come to the foreground. Article.
Update: there may be a downside. I am used to, many times every day, to drag a folder or file from the Finder into an app. Now I have to click on the finder first before it reacts. I'll have to see whether this proves too much of a disadvantage in the long run.