Well I'm a Sorc and the other caster is a Beguiler - so I have a pretty good idea about what spells we can cast :-)
But if the Binder class ever should be "fixed" - not that it need it - this is just me that want more. A few "rebind vestige"/day abilities would go a long way. Everytime you do some reseach about what comes ahead (knowledge checks, investigation, garher information, divination, rolleplaying with NPC's you name it) the binder would shine if he could adapt to the situation.
Sure you might still make a bad call (as the time i make a pact with Dehlve-Nar, to help me against what ever was driving the local pesants mad,0 - it turned out, they were shocked by undeads killing their childeren, not by some insanity spell) - but at, least the binder would have the choise!