According to Apple, the 10.7.1 update is recommended for all users running OS X Lion and includes general operating system fixes that enhance the stability and compatibility of your Mac, including fixes that:
• Address an issue that may cause the system to become unresponsive when playing a video in Safari
• Resolve an issue that may cause system audio to stop working when using HDMI or optical audio out
• Improve the reliability of Wi-Fi connections
• Resolve an issue that prevents transfer of your data, settings, and compatible applications to a new Mac running OS X Lion
For detailed information on this update, click here.
• Address an issue that may cause the system to become unresponsive when playing a video in Safari
• Resolve an issue that may cause system audio to stop working when using HDMI or optical audio out
• Improve the reliability of Wi-Fi connections
• Resolve an issue that prevents transfer of your data, settings, and compatible applications to a new Mac running OS X Lion
For detailed information on this update, click here.