Apple posted iMac Firmware Update 1.2 late last night. Here’s all of the dirt from the download page:
The iMac Firmware Update should be installed on all iMacs to prevent problems with starting up your computer. Apple recommends all iMac owners install this update. Instructions are currently in U.S English, but the update can be installed on any iMac worldwide.
The iMac Firmware Update version 1.2 should be installed on all iMac computers used in NetBoot client environments. Features delivered with this update include improved support of NetBooting and minor improvements to Open Firmware for Mac OS X Server. The update also corrects a rare condition wherein SGRAM amounts over 2MB may not be properly identified at startup. This update incorporates the iMac Firmware Update 1.1 software.
Go get it and may the Force be with you.