Yeah, I'll probably do more at some point, but I just chose the ones I did because they were easy to come up with powers for and were a pretty diverse group.
I didn't think about that (I wrote basically all of this up about 2 days after 4E came out and I didn't even think about how you replace powers at higher levels), so I'll have to think back over it. I might say that you can swap in a Binder power for any Warlock power of that Binder power's level or higher. As in, you could swap in a level 6 Binder Utility power for a level 6 Warlock spell, a level 10 Warlock Utility spell, a level 16 Utility spell, etc. That might need some tweaking, though, so I'll have to look back over it first.One thing I notice is that some become less useful at higher levels. With retraining, this doesn't seem to be a problem (and in fact appears intentional), but some way for the powers to scale may be good. Also, you might want to make it "same level or lower".
Well, I figure it fits Warlocks better than anything else, but I guess it could actually work for any class that could use the ritual. I'll have to ponder on that a bit, though - the powers were designed to give the Warlock (an Arcane Striker) some more Control and Striker powers, and I don't know if it would really fit for Fighters or Paladins or whatnot. I don't know if it could HURT, though...EDIT: Also, why warlock specific? I mean, I can see reasons for it, and a multiclasser could qualify, but...