Scott already alerted you to this update and it should come in just fine in Software Update. But to you and me, what does it mean?
The most visible is the fix for the previously reported Airport exploit featured on MoKB. Of course the reporting researcher took an immature cheapshot at John Gruber (daringphucball is what he named it). That researcher was credited (amazing, considering he supplied real exploit code).
There are a bunch of vulnerabilities that can be caused by a local user crafting a malicious file and invoking with a variety of services. The Finder one is particularly troublesome.
Also, the Installer issues identified by Adam Knight that allowed installer packages to attain system priveleges without explicit admin permission has been fixed. You must now authenticate to supply those services to pre and post flight scripts.
There’s also a WebKit update, meaning Safari and browsers using that kit will be reinforced by this update.
I highly recommend everyone install this update. There are several very dangerous insecurities fixed. I know the first thing I did when I saw it was to install it.
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Glad to see that Installer problem fixed