Dead pixels are very common with LCD (flat panel) screens. They're inevitable. An iBook's screen, for example, has 786,432 pixels (1024x768). If screen manufacturers wanted to get 100% perfect screens every time, the cost would be outrageous.
Apple, like most other companies, will offer warranty replacement if you have +/- 5 dead pixels in close proximity. This is reasonable.
Sometimes, lightly rubbing a dead or stuck pixel can bring it "back to life," but otherwise you'll just have to live with it.