I am interested in knowing what you ban in your games. I usually have disjunction banned. I also have PAO banned although I have kept the other polymorph spells.
I am interested in knowing whether you ban/nerf the planar binding spells, and why. I have heard that abuse is possible with them although I haven't actually tried them myself. If you can throw some light on the kind of abuse that is possible with these spells I would appreciate it.
Planar Binding is pretty rough. A common use of the spell is to summon Imps for their Commune ability, which more or less gets you access to pertinent information regarding anything. This can trivialize many non-combat scenarios.
Summon a Glabrezu and take his monthly Wish spell. Don't call a specific Glabrezu, just "Glabrezu" in general, and you should get a new one every time you summon, so you can do it multiple times a day. If you fail to overpower his spell resist, he's only CR13.
So, right before that, if your party can't kill a CR13, summon an Archon and request he help you with your next encounter against a demon or devil, something they're happy to do (so it should succeed).
Bind a Succubus and have her seduce the local King/Lord/Magistrate/High Priest and you have blackmail against them, which again can trivialize a lot of non-combat encounters.
Summon an Efreeti for unlimited wishes for only a 6th level spell at no real cost to the player. Take a piece of it's flesh before it leaves, make a simulacrum of it, and you've got three wishes every day for the rest of your career.
Can nab you Permanency. Erinyes have always-on True Seeing. Lillends have Identify. Planetar casts Raise Dead. Noble Djinni can also grant three wishes, but you can just demand their servitude (which is one of their core traits, similar to the genie in the lamp idea).