Dead pixels are, indeed, a fact of life with most LCD projectors. If the pixels bother you in the course of normal viewing, return or exchange the projector. From a normal viewing distance, one dead pixel (particularly blue -- green are more visible) shouldn't bother you on a 10HT. But if it does, swap it out.
Perfect LCD panels do exist -- but beware, there are far worse problems out there than dead pixels. If this is a good unit that operates well under normal conditions, I'd keep it.
FWIW, I have two dead pixels (one blue, one green) on my 10HT. I only notice them when I mute the picture and stand right next to the screen. Under normal conditions, I never see them.