Apple has released MacBook Air and MacBook Pro Update 1.0 for the models introduced in June 2012: both 13- and 15-inch sizes of the MacBook Pro, the MacBook Pro with Retina Display, and both the 11- and 13-inch versions of the MacBook Air. The minimal release notes say that this release “fixes an issue that can lead to increased CPU power consumption, and it improves compatibility with some USB devices.” Requiring Mac OS X 10.7.4 Lion, the update should appear in Software Update for affected models, or you can download it directly from Apple’s Web site. (Free, 76.64 MB)
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Multi-Monitor iChat in Snow Leopard
In Snow Leopard, on a multiple-monitor system where you're using screen sharing over iChat, dragging the tiny inset preview of your own screen to another monitor shifts the remote screen to that monitor.