In my games we went with +2 Strength, +2 Constitution, -2 Wisdom for attribute bonuses and kept rest the same. Check out the conversion forums for more info on their other racial traits.
this set of stats he uses actualy more closly matches what wizards has done with the warforged in 4e well except they dont have any negative stats on chareters any more so its more up to players to pick wich to keep but the 2 positivs are the same they use i have the 4e pdf on warforged i figerd id keep it cause it was free from them and i could use it as a rough guid on a conversion if i needed one and mabe it owuld have some new magic items or feats i could convert back