When working mouse will randomly move even when I'm not moving it

When working on my computer my mouse will randomly move even when I'm not moving it. It is like I have a ghost mouse that is moving across the screen by itself. I checked and made sure screen sharing isn't on. It occurs randomly from what I can tell. It happened twice tonight where I'm on a window with my hand on the mouse and the cursor will move up to the top of the screen and then to the very left (which will turn on my screen saver). I will make me feel better if someone has seen this to. It happens very quickly and I can get control of my mouse. I have seen this off and on for a while. Anyone else?

I have the same issue.
It is a wired Mighty Mouse on a 24" iMac. My Macbook Pro with Wireless Mighty Mouse has never had an issue that I can recall, only the desktop.
It's pretty **** annoying to be fencing something in on Photoshop and suddenly your mouse is up in the corner of the screen and you've selected half your picture.
Anyone have any thoughts? What are the common denominators here?
As I said, 24" iMac running 10.5.5(although it has been happening since I purchased the computer somewhere around 10.5.3) Corded Mighty Mouse, Aluminum Keyboard. Can't think of any other relevant information....

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Repost: probably not suited to the camra, photos and video forum
Okay, I've used up all the (limited) options I can think of here.
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My first link shows the movie library. The files include apple's diagnostic files that are rated for use on this iphone, and a video presentation file of mine that works on the iPod Touch under OS3
http://picasaweb.google.com/lh/photo/JUo-74cOxXOGsMinIuVoXQ?feat=directlink
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http://picasaweb.google.com/lh/photo/lpSwzQ2tnu88f_STvuEjhQ?feat=directlink

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"SafeBrowser'',
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''cor-el'',
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This is not a reply. I just want to elaborate on this problem.
My computer freezes occasionally when it is used after being sleep for a while. The spinning ball appears and everything is totally disabled. Nothing on the keyboard works.
The mouse moves, but does not work.
The only solution is to turn the power off and on (losing all data in open applications.)
I kept the System monitor running on the side to find out which program was running when the computer froze. The Monitor as well as all other applications froze, but the data showed:
Firefox 18.4%
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This is all the information I have. By the way, I am using iMac with OS 10.6.

When working mouse will randomly move even when I'm not moving it

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