For the paranoid among us:

Those of you who’ve bit the bullet and sprung for an iPod Touch (or an iPhone) and are concerned about the screen issue that has come up (faulty rendering of blacks and all) but can’t tell if your new toy is one of the defective ones, or if you’re just worried about stuck or dead pixels like we all are, there is a free online test that you can use to detect any problems. (Would that there were more of these free and useful things around, huh?)

read it here inquirer.net