"About MacBook Air EFI Firmware Update 2.3
This update enables Lion Recovery from an Internet connection on MacBook Air (Late 2010) models and addresses an issue where the system could restart if the power button is pressed immediately after waking from deep sleep.
For more information about Lion Recovery, please visit: www.apple.com/macosx/recovery/
System Requirements: OS X Lion 10.7.3 and later"

Per Apple doc, EFI version after update should be MBA31.0061.B07.
  

"About iMac EFI Firmware Update 1.8
This update enables Lion Recovery from an Internet connection on iMac (Mid 2010) models.
System Requirements: OS X Lion 10.7.3"

Per Apple doc, EFI version after update should be IM112.0057.B01.
  

"About MacBook Pro EFI Firmware Update 2.6
This update enables Lion Recovery from an Internet connection on MacBook Pro (Early 2010) models.
System Requirements: OS X Lion 10.7.3 and later "

Per Apple doc, EFI version after update is MBP61.0057.B0F. (IDs are MacBookPro6,1 and MacBookPro6,2)

There was an EFI Firmware update released on Jan 23rd to add Lion Internet recovery for the 13-inch Mid-2010 MacBook Pro (EFI Update 2.5). (As of tonight that D/L page still has not been corrected for MBP rom version.)

  

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