You can read more about exactly what the Plaza's butlers do in this New York Times article from a couple years back. We also suspect that with The Plaza's recent announcement that all guestrooms will have iPads come September that the butlers will have something to do with that as well.
Until then, tack on a 30 percent savings on your stay in a suite (the Business Butler package is only available in suites), one complimentary suit pressing per stay, one complimentary full American breakfast in The Palm Court daily, and a 20 percent discount when entertaining clients in The Palm Court, The Rose Club or The Champagne Bar. (What, no entertaining at Eloisie's?) That, friends who need to care of a lil business, is what makes up the Business Butler Package.
It's available year-round for stays Sunday through Thursday only. Rates start at $592 a night (based on double occupancy in a Rose Suite).
We're pretty sure the white gloves aren't included, but maybe if you ask Jeeves nicely he'll hand them over at the end of your stay. Just remember to leave a kind word for him on Foursquare.