Weird display problem with iMac 24"

Hi guys, I have a very weird problem with my 24" iMac. For some reason it seems that after approx. 10 minutes using the Mac, whenever I keep a window on top of another window and then I minimize it, it keeps there like a ghost for another 5-10 seconds until it fades away slowly slowly.
Sometimes it's hard to see it however it's very evident when using a white window (such as Safari) on a dark background (not black).
I'm attaching an image split into 2 parts, the 2nd part is shot exactly after I minimised the browser. It clearly shows a faded ghost image on the grey Photoshop canvas.
Here's the pic:
http://www.neilazzopardi.com/imac.jpg
Has anyone ever experienced a problem similar to mine? or am I getting paranoid?
By the way, I bought this Mac, 5 months ago and I don't know whether this problem has been there from the beginning but I only noticed recently while cropping in Photoshop and still seeing the parts I removed away very faded.

den.thed it's not that I took it the wrong way or anything but shouldn't I be doing whatever I like with my iMac?
For the record that is a dark grey Photoshop canvas, which just happens to show the problem much more evidently.
The problem is that it happens on any background (even desktop) with any window, even Adium etc. Their ghost just stays there for a while... I use the iMac for design purposes and it's very annoying especially when cropping a picture and what I just cut out stays there very faded...

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