Door of Decay from Complete Champion should get a special mention, as it is the only non-Necromancy spell that a Dread Necro can learn with Advanced Learning.
It also gives the Dread Necro something it lacks in long range travel (though self only). Leave a single human (or anything else your size or larger) skeleton in a safe location and use your other minions as an escape route. Alternatively, send the tireless minion ahead and rapidly get someplace yourself.