working together, what have you done?

[SamsDisciple]

So my dm (3.5) loves to pit us up against enemies who are higher cr than we normally can handle so its essential that as a group we work together. I am looking for tactics that your groups have used to work together consistently. I am sure we have fun combos like my group had fun when the blaster mage cast black tentacles and the telepathic bard bluffed all the small fry enemy's that it was really a powerful demon being summoned and they needed to run away. Those examples are great but I am looking for high level combos that can work consistently like touch of idiocy to lower will saves followed by hold person then coup de gras, or basic mechanics for simple combos like one guy tripping while another AoO's.

[Prime32]

touch of idiocy to lower will saves followed by hold person then coup de grace

shivering touch followed by coup de grace. With a scythe.

Bull rushing enemies past a guy with Combat Reflexes so they provoke AoOs from him.

[Critical]

Characters of what class do you have in your group? Or are you looking for general advice? If so:

Fling Ally/Fling Enemy feat(s) + Any small or smaller size category character with sneak attack or iaijutsu focus(probably with gnome quickrazors, too) with Confound the Bigfolk feat, though, if it's an ally, it would be best for that ally to have higher initiative than your own, delay their turn and have some way to stand up from prone as a free action(DC 35 Tumble check is one of them)
Grease/Marbles/Anything that makes someone balance, really + Sneak Attacker - not getting flat-footed while balancing requires 5 ranks in balance, and who puts ranks in balance anyway?
A fun one, though, more for low levels - a dragonfire adept in your party with entangling exhalation feat + allies with oil flasks
There is a save reducer build which can help out your casters a lot, the basics are 4 levels of Hexblade, taking the dark companion ACF for -2 to saves, binding Focalor for another -2, there's more but I don't remember it. You can do well on your own too, but you'll need a paralyzing scythe(probably poisoned, too), or something similar.

That's all that I have on top of my head, hope it helps.

[Prime32]

Something that came up before in a game with a fairy of some kind and a human ghost. They can share a space to make the fairy practically immune to damage.

[SamsDisciple]

Well we are restarting an old campaign to continue the story but most of us lost our character sheets. I have a mindbender/enchantment specialist with cohorts to plan for so those are blank slates, they can be anything form core, complete____, phb 2, libris mortis, heroes of horror.

[Fouredged Sword]

Everything can be solved with leadership!

Level one wizard minions with fell drain sonic snap! Nothing says good morning like 20 to 30 no save negative levels!

[gallagher]

steadfast boots are a must for your party meatshield. some people prefer other boots, like striding and springing or elvenkind. let me tell you, your weapon is always considered set against a charge.

that means grab your favorite piercing weapon (i prefer the good ol' fashioned lucerne hammer) and stand there, especially if you have thicket of blades. when melee guys try and charge at you and the caster, you dont even take up an attack of opportunity!