Necromancy and Conjuration (summoning and binding) are topics that were fairly thoroughly addressed in previous editions of D&D, and these topics certainly pop up often in fantasy literature. I don't see these in the D&D 4e books anywhere, are they addressed at all in this edition? Are there any add on books that cover them?
Inspired by Raising Dead and Binding Daemons
Best Answer
Summoning was introduced as a new keyword in Arcane Power on pg 98:
New Keyword: Summoning Powers that have the summoning keyword bring creatures from other planes to serve you in a variety of ways.
It also has new build: Summoner Wizard. There are a number of powers in Arcane Power that have the summoning keyword.
PS: I don't know much about the necromancy side of this question, other than there is necrotic damage...