Question said:

What feats would be useful for a dread necromancer? Theres one that allows you to heal negative energy as undead isnt it, for charnel touch?

Charnel Touch is a class feature of the Dread Necromancer. It's not a feat, it's just an ability they get. The feat you're thinking of is Tomb-Tainted Soul, from Libris Mortis. Any of the corpsecrafter feat chain would be good. Dark Speech from the BoVD (as well as any number of other vile feats, if that's your kinda thing) would fit. Spell Focus (necromancy) if you want to get real basic. There are plenty of good options for a DN.

Also am i missing something with the corpse crafter feat? I can use summon undead V to create a mummy with +32(8 hit dice x 4) enchantment bonus to strength?

I don't know where you're getting the idea that you multiply the strength bonus times... anything. Corpsecrafter gives the undead (the mummy, in this case) a +4 enhancement bonus to strength. It also gives it +2hp per HD.

The dread necromancer seems to be (mostly) about summong and buffing undead. Am i correct?

Summoning or creating undead, augmenting undead, debilitating enemies, and using death, disease, and negative energy to various ends. That's the Dread Decromancer in a nutshell.

Btw does the negative energy burst heal the DN if he has tomb tained soul?

Yes, it would. Just as it would any normal undead creature in its area.

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