Firmware updates, they make a difference.
Per the cool cats at Mac|Life, Apple today released an EFI update for the MacBook Air. The update, available here or via Mac OS X’s built-in Software Update feature, works to boost the stability of Lion Recovery from an internet connection and fixes the Thunderbolt Display compatability issues with Thunderbolt, as well as remedies any issues with the Thunderbolt Target Disk Mode performance.
If you’ve tried the firmware update and noticed any changes, please let us know what you make of it in the comments.