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Apple this week issued a pair of firmware updates, resolving a flickering graphics issue in late 2008 15-inch MacBook Pro models and addressing a hanging graphics issue on iMacs.



From AppleInsider:
The MacBook Pro firmware update is recommended for 15-inch, late 2008 models. The fix resolves a graphics issue that may cause the internal display to flicker. The file is a 1.79MB download and requires OS X 10.5.8, OS X 10.6.8 or OS X 10.7.3.

Apple has released a slew of EFI updates in recent weeks. Last month, the company issued several updates for 2010 Mac models that added support for Lion Recovery over an Internet Connection.
  Apple issues iMac Graphic, MacBook Pro EFI firmware updates