Maybe this question is answered in here somewhere. I've perused quite a bit though, so I'm unsure.

Curious as to whether or not anyone could give me a rundown on Invoker edges as far as which ones are useless, which ones are must-haves, etc. I have a lot and if this place is like other muds there are inevitably going to be some skills/edges that just aren't used much.

The help files tend to give a pretty good breakdown of what each edge can do, and it isn't likely that anyone will give you a true list of what they all do because most immortals who coded them likely have a hard time even remembering them all. One thing you can be sure of is each player has their own spells that they like as an invoker and those are the ones you will have to give a try, the ones that best suit your char. Sadly it is kinda like, guess, check, and revise.