Seriously I just got my iMac with Leopard, and I absolutely love it. Starting into Vista on the black screen I can see the same issues you are complaining about, but be honest, out of ALL the things that can be wrong with a system, you're going to complain about uneven backlighting? Out of the 2.4 (roughly) million pixels on the screen I have one bad one, am I complaining? No, the purpose of a computer is for many uses, but if you're going to sit here and slam apple day after day for one issue, give them a fricken break. Everything else on the system is so nicely designed and well laid out, I give props to Apple, this is the 2nd computer of my own and after using hundreds of friends, family, and school computers, this is the one I love the most to sit down in front of and just use....
So yes I have the same issues, but you hardly ever notice them and if you buy an iMac, go with the 24" screen, and prepare to get some headaches because the screen is so big!