Having spent far too much time on a 3e MUSH, my vote goes to both gnomes and ken-errr-halflings.
I blame Dragonlance. It seems like now everyone that plays a member of either of those races has to play them like the Dragonlance versions: idiotic kleptomaniacs in the case of halflings, and even more idiotic mad scientists inthe case of gnomes.
Oh, and because they're short, players think they have to act like annoying little kids.
I long for the days of the hobbitlike 1e halfling. I'd even settle for seeing halflings played like the gypsy wanderers of default 3e. And if I never see another gnomish inventor it will be too soon - give me long-nosed, jewel-loving, hill-dwelling civilized people instead of an entire race of madcap misfits, thankyouverymuch.
J