Stony Grasp (Complete Arcane) is awesome for RP purposes, since you can basically have a massive hand reach up, pin your foe, and hold it in place at the mercy of your stinging wit or merciless questioning. When someone has information you want, but wants to kill you, Stony Grasp beats just killing them and hoping you can get some info off of their carried items.
Fly is a staple 3rd-lvl spell, but you have wings, so it's really only useful for your companions.
Resonating Bolt (Complete Arcane) is good for parties who don't have a Goliath Barbarian with Destructive Rage to knock down iron doors for them. Actually, it's great any time you want to really mess up inanimate objects without starting a structural fire or forest fire with your fireball (not to mention those DM's who like using the old Fireball rules that can "squirt" back out of small rooms!) It's one of the most versatile area-affect, damage-dealing spells, because nothing resists its sonic damage, even objects. Of course it's a line, not a sphere, which can be a problem sometimes *shrug*
Dimension Step (Player's Handbook II) is a good way to get your party past traps and obstacles. I haven't personally seen it in action, but it sounds good from it's description.