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"This update addresses an issue that makes the system unresponsive when using iTunes," Apple notes on its support page.
The patch is just 461 KB and requires Mac OS X 10.6.7 Build 10J869 to be installed first. Both are available from Software Update.
The system lockup problem on new 13 inch Air models appeared in Apple's discussion forums after the release of Mac OS X 10.6.7 as an easy to replicate issue that resulted in having to force reset affected systems, indicating that the problem was inadvertently introduced with last week's larger update.