Warforged barbarian - Pretty basic, a good old Power Attack charger build. Starts with, of course, Lion Totem Barbarian, and goes into Warforged Juggernaut and Frenzied Berserker. He's one of the group's main frontliners.
Lesser Aasimar cleric of Raziel - This player is probably the group's biggest optimizer. While he usually keeps the cheese to the minimum, he nonetheless goes DMM with quite a few PrCs (if I recall correctly, Church Inquisitor, Prestige Paladin, Ordained Champion, and Sacred Exorcist).
Human druid - For fairness' sake, the druid uses the Shapeshift variant from PHB II. Nonetheless, she's quite a potent combatant, often summoning with Nature's Ally and then rushing into the thick of combat.
Dwarf Deepstone Sentinel - This guy is basically the party tank. He's likely the least optimized of the group, or nearly so, but is still a big roadblock for monsters. Before entering the Deepstone Sentinel PrC, he's a fighter/crusader.
Snow Elf Swift Hunter - A pretty basic build, mostly ranger with a few levels of scout, this guy is a ranged skirmisher. While not the most powerful party member, he's the group's primary source of ranged damage. A note: he's traded away his animal companion for an alternate feature.
Lesser Tiefling rogue - A TWFer, the rogue (well, like every rogue) is out to maximize Sneak Attack. He goes into Nightsong Enforcer,
Avenger, and one more PrC - Shadow Thief of X or somesuch. (Note to self: get copies of character sheets ASAP).
Wood Elf warblade - Another charger build. This character's main weakness is that he, as a straight warblade, doesn't have Pounce as an innate feature until later on, instead relying on Lion's Charge spells from the divine casters - but this is mostly offset by the versatility of his maneuvers.
Human wizard - A Conjurer, he fancies himself a blaster-type wizard (using the Orb line of spells), but more for flavor than power. The player is a big optimizer, though, and while he restrains himself by gentlemen's agreement he's perfectly capable of making a Batman-esque demigod. He PrCs into Incantatrix and Archmage (might eventually have some Fatespinner in there, can't quite remember).