MacBook Air owners take note: Apple has released MacBook Air EFI Firmware Update 2.0, which the company recommends for all users of the late-2010 11-inch and 13-inch MacBook Air models. The update corrects what Apple terms “a rare issue” where the MacBook Air either powers on or wakes up to a black screen, or becomes completely unresponsive, which is bad. As is often the case with these firmware updates, your Mac must be plugged in to install it, and a gray screen with a progress bar will appear after you restart. Apple strongly recommends that you neither disturb nor power off your MacBook Air during the installation of the firmware update. (Free, 2.41 MB)
Avoid Simple Typos
If, like me, you find yourself typing 2911 in place of 2011 entirely too often, you can have Mac OS X (either Lion or Snow Leopard) fix such typos for you automatically. Just open the Language & Text pane of System Preferences, click the Text button at the top, and then add a text substitution by clicking the + button underneath the list. It won't work everywhere (for that you'll want a utility like Smile's TextExpander), but it should work in applications like Pages and TextEdit, and in Save dialog boxes.