In light of the recent security breach at certificate authority DigiNotar, Security Update 2011-005 removes DigiNotar from the list of trusted root certificates and from the list of Extended Validation (EV) certificate authorities, and configures default system trust settings so that DigiNotar’s certificates, including those issued by other authorities, are not trusted (for more info, see the links in "Firefox 6.0.2," 8 September 2011). The release is available for both Mac OS X 10.6 Snow Leopard and 10.7 Lion, and it updates both Mac OS X and Mac OS X Server. (Free, 869 KB for Snow Leopard, 15.59 MB for Lion, release notes)
Mac OS X Zip Expanding Utility
Firefox (and possibly other applications) may ask you what you want to do with .zip archives that you download from the Internet. If you want to expand them with Mac OS X (rather than StuffIt Expander), you may be unsure of which application actually does the job. You're looking for Archive Utility (in Leopard and later) or BOMArchiveHelper (in Tiger). In either case, the application is stored in Hard Drive/System/Library/Core Services/. Don't move it from there, though, or you'll confuse matters.
Security Update 2011-005
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