Mac OS X 10.7.1 is said to fix problems with video playing in Safari, improve the reliability of WiFi connections, fixes the audio bug when routing data from a Mac via optical or HDMI adaptors. For the MacBook Air, the update is said to deal with the screen flickering issue, and is said to boost the speed of SD card data transfers on the Mac Mini. Random black screen of death crashes that were introduced with OS X Lion are said to be fixed, though not everybody has been reporting the same thing.
The update is only about 17.4MB, which shows Apple’s new decision to issue smaller but more frequent updates to the operating system. Head here for the update if you’re using the latest MacBook Air or Mac Mini, and here if you’re running anything else.