Stuck Pixel, but from graphics card, NOT LCD

Question

Two days ago, I noticed two stuck white pixels on my 30" Apple Cinema Display. This display is plugged into the Mini-DisplayPort -> Dual Link DVI adapter and then into my unibody 17" Macbook Pro.
This all sounds fine and dandy, a somewhat common occurrence. But it's not.
If the pixels were really dead pixels on the screen, they wouldn't move. When I use the screen zoom feature (control-scrollwheel), they move. When I put the mouse in a certain position while zooming, I can actually push the "dead pixels" from the 30" display back onto the 17" laptop's display. The pixel also gets pixelated when it is zoomed.
I can cover up the dead pixels with the mouse (and not have a strange stationary dot on the mouse), and they appear in screen shots (taken with command-shift-3)
I rebooted the computer once, and they went away. Soon after, one of the two came back.
Sleeping the display and/or the computer does not make them go away.
They remain there when I switch spaces (their physical location on the screen stays the same - they do not slide and reappear in another space), and are there on top of any application. This includes all applications that may use Core Graphics (Quartz 2D), Core Animation, OpenGL, etc to display their interface.
Does anybody have the foggiest idea what is going on?

Answer 1

Ok, so I have more information:
• The Firmware's Diagnostic Utility found nothing wrong (which, after the next few bullets, will make sense)
• When at the login screen, the dot doesn't appear.
• When logging in, the dot appears at the same time as the SystemUIServer for my user launches. Upon logout (or switch-users), the dot disappears at the same time the SystemUIServer goes away (hidden or quit)
I have a more thorough and easier to follow demonstration (using video) here: http://www.kd7qis.com/MBPPixel