Current (new) campaign has humans (different types depending on nationality) - a mix of common men, bear tribes, etc; elves (wood & high); halflings (generic); Dwarf; Half-Dwarf; Half-Orc; Half-Elf (generic).
I've altered the stats on most of the races to reflect the cultural differences for each nation, especially the humans. Example: one race is modelled after North American Natives - big bonus to many outdoor skills, riding, stat bonus altered to reflect, etc. Another nation is based around an old chivalric order and so favours heavy armours and disdains bows - so they get big bonuses to don/doff armours, maneuver in armours, etc and penalties to bows, ships, etc.
In most RM campaigns, we run with common man, high man, bear tribe, dark tribes (renamed Southerners), half-elves (4 types), halflings (3 types), dwarves, half-orcs and elves (3 types).
We don't normally use races like centaurs, pixies, giants, etc for PC's. Haven't had any complaints or requests for non-standard races...