Apple has released a software update for the 13-inch MacBook Air (Late 2010) that addresses an issue with the system freezing when iTunes is in use.
Mac OS X v10.6.7 Supplemental Update for 13" MacBook Air (Late 2010) - 461KB
This update addresses an issue that makes the system unresponsive when using iTunes.
It is recommended for all 13" MacBook Air (Late 2010) users running Mac OS X v10.6.7.