Apple has released Mac Pro SMC Firmware Update 2.0 for Mac Pro models released at the end of 2013. The System Management Controller (SMC) update enables most Power Nap activities to proceed without running the Mac Pro’s fan, and it fixes a rare problem that prevented low-speed USB devices from being detected at boot. As always, be careful not to interrupt the update process when applying a firmware update. (Free, 585 KB)
Smarter Parental Controls
If you've been using the parental controls options in Mac OS X to lock your child out of using a particular computer late at night, but would like to employ a more clever technique to limit Internet access, turn to MAC address filtering on an Apple base station.
To do this, launch AirPort Utility, select your base station, and click Manual Setup. In the Access Control view, choose Time Access to turn on MAC filtering. You'll need to enter the MAC address of the particular computer, which (in 10.5 Leopard and 10.6 Snow Leopard) you can find in the Network System Preferences pane: click AirPort in the adapter list, and click Advanced. The AirPort ID is the MAC address.