PC's classes and usual tactics?
There's an ubercharger using a modified "Captain Constitution" build(because with all the template he's using, many of the build's stats were becoming useless). He's the group's most ridiculously powerful character. Under perfect circumstances he'll be dealing close to 4000 damages on a turn(if everything crits on his Kaorti Resin weapon(Kaorti Resin makes the weapon's crit multiplier x4))
There's a dread necromancer//Artificer paragon demi-lich who can come back to life a few rounds after he was destroyed since his phylactery is within his demi-plane where time goes to the rhythm of one day per round outside. He uses epic spellcasting(his dispel is his most seen used spell until now, though he has an invisibility spell and an area of effect damage spell) He made items for everyone in the group, which is why all stats just sky-rocketed on everyone(+30 to all skill checks, a lot of +10s to ACs(Divine, insight, luck, sacred, profane, etc.) and all abilities at +12, but there are also the immunities thrown around(Mind-blank, freedom of movement, energies).
There's a Druid which did not do much yet in combat, letting the others deal with it as they are more than capable of dealing with any threats he could even hope to lay a hand on.(Kind of troublesome for me as a DM by the way, as if I want to let him have fun, all other players are guaranteed to hit all the time.) He's developing Epic spells but I don't know what those will be yet, guess he did not finish making them.
Lastly, a Vampire Lord who uses spellcasting(I believe he can cast 9th Arcane and Divine at full sorcerer and cleric level. Also has epic spellcasting, but also working on developing them as we speak so I also don't know what those will be. I expect to see dispelling at least.
As a group, they usually hit the demi-lich a bit to activate his masochism and their sadism before hitting the enemies in front of them. If the demi-lich dies, it can come back quickly the first time thanks to astral projection, which he does not use twice in case the enemy can simply dispel him after.
That's all I can think of for now. Thanks muktidata for your interest. Thank you Keldar and Ithamar also, those build seem interesting, though I don't get what Dragonfire Adept can bring to it from a quick skimming of its abilities. I'll have to look deeper into it.