JOSHMUNKEY  KAWAII- the update was posted on apple's site on the 10th, and is listed on apple's official download page in between recent security upgrade links. the "more information" link yields a page with this on it:

Version: 1.0.2

Post Date: September 10, 2009

Download ID: DL938

it is indeed a newly posted firmware update- yet for whatever reason, it's not updating apparently for systems that are within the described specs.  
(Version 1.0.2)

MISHA  Thanks for the kind words of support, KAWAII, you're one of our favorite users!  
(Version 1.0.2)

KAWAII  From the sounds of things reading the Apple thread, Apple didn't include the necessary digital signing to allow a firmware upgrade to take place. The digital signing of firmware updates was put into place recently after a security expert noted that one could hack the keyboard using a malicious firmware update.  
(Version 1.0.2)

SIDDHARTHA  same exact situation here-says I don't need this update  
(Version 1.0.2)

STAR-AFFINITY  If you've clicked the "For detailed information on this update, please visit this website" you'd see:

"It updates the graphics firmware on the ATI Radeon HD 2600 PRO card to address issues that may have caused the computer to freeze.

Not every 20-inch and 24-inch aluminum iMac computer requires this update. If you are not automatically presented with this update, your computer does not need it."  
(Version 1.0)

MAC ADAM  I know/was read, but I trust only user experience.

If u was read what I was wrote, Is writen "let us know your experience "… isn't it ?  
(Version 1.0)

MACUPDATE ADMIN  As it states on the MacUpdate page and on the Apple page for this update:

For detailed information on this update, please visit this website: http://docs.info.apple.com/article.html?artnum=307008  
(Version 1.0)

BONTFAEN  Thanks for attempting to clarify the situation, I had already the link on apple's sit before posting this comment. The paragraph I believe which could be expanded a little is:

"Not every 20-inch and 24-inch aluminum iMac computer requires this update. If you are not automatically presented with this update, your computer does not need it."

What this or the rest of this article doesn't say is what exactly is the problem that is being corrected and why some iMacs are not affected and don't need their Graphic card's firmware? Most people would like to know a little more than this, to reassure them in a more specific way so they can check for themselves.

I personally like more control rather than rely on a message like, "don't worry if I don't call you you don't need this update" - I would prefer "Relax the problem is with ???? & all Radeon 2600 Pro cars with ROM Revision: 113-B2250F-212 & EFI Driver Version: 01.00.212 are unaffected beacuse????  
(Version 1.0)