In addition to the security and system updates released earlier today, Apple has firmware updaters available for iMac graphics as well as Apple RAID cards.
The graphics updater improves stability on the Radeon HD 2600 Pro and Radeon HD 2400 XT graphics processors, included with some iMac models. It requires at least OS X 10.5.2 to install, and is under a megabyte in size.
The RAID card update includes the following fixes and improvements:
- Reliability improvements during boot and power fail recovery
- Addresses a potential issue when rebuilding a degraded RAID 5
- Resolves an issue that can fill the on-board flash file system
- Improves battery handling and reporting
It is recommended for late 2006 and early 2008 models of Mac Pros and XServes that contain Apple RAID cards.
As for all firmware updates, be sure to not interrupt the update process, even if it seems to be taking a long time. Doing so can break hardware and prevent your computer from running.