Apple has posted an EFI firmware update for certain MacBook Pros, bringing it to version 1.5.1.
The following are the description of the update and the instructions provided by Apple:
This update fixes several issues to improve the stability of MacBook Pro computers.
After the firmware is successfully applied to your Mac, your Boot ROM Version will be:
MBP21.00A5.B08 or MBP31.0070.B07
You can confirm the version of the Boot ROM installed on your computer using System Profiler.
To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/MacBook Pro EFI Firmware Update.app). The updater will launch automatically when the Installer closes.
The update is available either though the Software Update utility or from Apple's support web site [1].
In addition, Apple has released Firmware Restoration CD v1.7 which allows users of any Intel Mac to recover firmware in case of failure during a firmware update. It would be prudent to download and burn this CD before updating your Mac's firmware.