Here are the current teams:
First Team
LogicsFate: Haeron, Minotaur Fighter 4
Captain Tagon: Jasek Blacktusk, Bugbear Scout 4
Ravos20: Eqastra, Poison Dusk Lizardfolk Spellthief 4
DEFCON 1: Nikkitikkit, Spiderling Cleric 4
LiquidAtom: Charek Norak, Hobgoblin Ranger 2/ Fighter2
Ferrix: Aeryl, Sylph Rogue 4
And me, with "Vitalis", Warforged Healer 4
Second Team
spasemunki: Magruut, Goblin Rogue 1/Wizard 3
Argent Silvermage: Magira, Spiderling Sorcerer 4
Tailspinner: Kreek, Blackscale Lizardfolk Monk 4
(Acid_crash: Hobgoblin Necromancer)
As you can see, most niches are already occupied (provided everybody stays here, I'm not sure we can count on AC's necromancer, for example :\).
Artillery: Magira (2nd), Magruut (2nd)
Medic: Nikkit (1st), Vitalis (1st)
Sneak: Jasek (1st), Eqastra (1st), Aeryl (1st), Magruut (2nd), Kreek (2nd)
Tank: Haeron (1st), Nikkit (1st), Charek (1st), Kreek (2nd)
You could make another Medic (Cleric, Healer, Druid) or another Artillery (Wizard, Sorcerer, Warmage, Druid). If you don't want a spellcaster, another tough tank (Fighter with high AC and lots of hp) could be appreciated. That or a ranged attack specialist, our tanks are quite melee-centric.
Also, race-wise, we have:
Blackscale Lizardfolk
Bugbear
Goblin
Hobgoblin (x2?)
Minotaur
Poison Dusk Lizardfolk
Spiderling x2
Sylph
Warforged
For a party that's supposed to be goblinoid-centered, it's quite excentric.

But I say nothing, I'm guilty of playing a non-goblin myself too.