I run Natty on a Toshiba Sattelite L455-S5975, and have had a blurry screen since the day I installed it. Here's what it looks like (link).
Though I'm not sure if the screenshot is actually blurry or it just looks blurry to me. If I recall correctly, this did not happen what I had booted from the LiveCD, but only after I had installed it. I run a dual-boot with Windows 7 and Windows 7 still looks as good as always. I've tried a few suggestions from people with similar problems on this forum, but none of them worked. Can anybody help? I'll be eternally grateful, I've been using it like this for a month or so and it's starting to affect my vision.