Apple has released the OS X Lion 10.7.1 Update. You can obtain it via the Software Update component of the OS X System Preferences app.
Apple says it’s recommended for all users running 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.
° Resolve an issue in which an admin user account could be missing after upgrading to OS X Lion.