I can offer two comments:
First, the level 20 pet is excellent. It's called 'Fallen Hero' or something to that effect and is a tank pet with a wicked disease proc (if you played DAoC, it's alot like the Cabalist's Emerald Simulacrum). It does serious damage- I've seen it double hit plus proc with total damage in the 130-140 range- can pull with a conjured missle weapon and, best of all, generates aoe Hate so that you, the caster, can actually do some additional damage without getting aggro. It doesn't Taunt exactly but I have seen it be able to get aggro off me and back onto it in some instances after I've over-damaged the mob. It's totally revitalized me as a Necromancer.
Secondly, it would seem that Static Pulse and Bludgeoning earth are now on the same recast timer, so they no longer stack. We're back down to two stackable DoTs (unless you take one as your Training skill at 20- that one might still stack with the other two).