There has been two small updates recently to Mac OS one was :
Digital Camera RAW Compatibility Update 3.12
This update adds RAW image compatibility for the following camera to Aperture 3 and iPhoto '11:
• Canon EOS 5D Mark III
For more information on supported RAW formats, see http://support.apple.com/kb/HT4757.
The other was a bit more important:
This Java security update removes the most common variants of the Flashback malware.
This update also configures the Java web plug-in to disable the automatic execution of Java applets. Users may re-enable automatic execution of Java applets using the Java Preferences application. If the Java web plug-in detects that no applets have been run for an extended period of time it will again disable Java applets.
This update is recommended for all Mac users with Java installed.
For details about this update see: http://support.apple.com/kb/HT5242
I would recommend you install the latest Java Security update as soon as can, although you may not be affected, better to be safe than sorry.
I am always interested in your thoughts so if you have any comments or feedback then please feel free to add any comments, or you can mail me here.