I saw a news bit on concierges, and it was pretty clear: They are there to provide you with pretty much the whole shebang: Restaurant recommendations, concert tickets (when a show is sold out, a concierge may have the connections to get you tickets!), and yes, a tee time.

I wouldn't have thought that Hilton hotels were of this caliber, but if you're going to offer concierge service, it seems to me that you have to do it right, or not at all.