What kind of role will these guys fulfill? What class(es) will they have?
Well, for the 2nd level and higher ones, I was planning on having most of them be psions or psychic warriors, so they could contribute spells known during a Metaconcert, and provide Psionic and Metapsionic feats to borrow with Feat Leech. They can also provide crafting feats, so we can make any psionic items we want. I've already written up short descriptions of those (just what they provide, basically).
But that doesn't include most of the 50 first level guys, and there are still 2 or 3 second level guys I haven't written anything for, also. So they can be whatever we want, I guess.
As far as RP goes... I guess this is going to be our "cult following".
I'm thinking some Marshals for auras, a Binder with Skill Focus: Diplomacy, that can hit DC 30 as a standard action, another Binder (or the same one) with Improved Binding that can use Malphus' bird to scout (or maybe more than one of these guys, that power is awesome), and that's about all I've came up with for the 1st level guys.
Here is Lilt's old thread on useful minions. I've been looking over it a bit.
Via Metaconcert, we can also use these guys to defray XP costs for powers, which I've already abused to add a couple of powers via Psychic Chirurgery.