Necromancers have always been one of those classes that people just seem to want to do.
Misfit Studios gives a new one (out of maybe a dozen for 3.x). The Necromancer core class is a wizard, but has a number abilities that makes it unique. It is basically a buy-the-book Necromancy-using wizard, but there are also some new feats and skills that make it more useful. There are some new prestige classes and magic items as well. The only thing missing really are some new spells.