As of 10.4.3, it seems Apple has changed the location of the "About this Mac" images, and made them into one image. It took me some time to find the location of the new image with Terminal, as the usual places were not working.
The new file can be found in /System -> Library -> CoreServices -> loginwindow.app -> Contents -> Resources -> MacOSX.tif. This TIFF now holds the Apple image and the Mac OS X tag line.
There are other places, however, that still use the two-image format (applelogo.tif and MacOSX.tif), such as:
- /System -> Library -> CoreServices -> SecurityAgent.app -> Contents -> Resources
- /System -> Library -> CoreServices -> SecurityAgentPlugins -> loginwindow.bundle -> Contents -> Resources
- /System -> Library -> CoreServices -> SecurityAgentPlugins -> MCXMechanism.bundle -> Contents -> Resources

