If you're sitting in front of your brand-spankin' new MacBook Air or MacBook Pro (or standing, which seems to be the trend nowadays), you might want to take a break after reading this and run Software Update. Apple has released the MacBook Air and MacBook Pro Update 1.0.
According to Apple's documentation, the update fixes a problem with "increased CPU power consumption" and it also "improves compatibility with some USB devices." Apple recommends the update for the new MacBook Pro and MacBook Air models that were release in June. That also includes the new Retina MacBook Pro.
Besides running Software Update, you can also download the update from Apple's Web site. Update 1.0 is 76.64MB and requires OS X 10.7.4.