Lion gets updated today to 10.7.1 and includes various bug fixes that I've included below. Throw up Software Update and let it go for its life to update your Mac and enjoy the new updated OS and included bug fixes. The next update from Apple will be 10.7.2 and will include iCloud compatibility, until then patience is required for some new features.
The bug fixes are:
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.
Resolve an issue where MacBook Air may boot up when MagSafe Adapter is attached
Resolve an issue causing intermittent display flickering on MacBook Air
Resolve an issue that causes the SD card slot in Mac mini to run at reduced speed with SD and SDHC media