I have a Dell U2410, which, while not exactly run-of-the-mill (it is wide-gamut), isn't that fancy yet does have all the ports wlesieutre mentioned. (Granted, they require a separate USB connection, but it is an older monitor.)
At work I have an Apple monitor that has multiple USB ports and an Ethernet port on the back of it. I think it has speakers too. All that and the display run across the mini-DP connection. Again, not exactly run-of-the-mill, but well within the price range of Apple's target market, and given Apple's push in that direction, it's liable to be commonplace in a couple years anyway.
At work I have an Apple monitor that has multiple USB ports and an Ethernet port on the back of it. I think it has speakers too. All that and the display run across the mini-DP connection. Again, not exactly run-of-the-mill, but well within the price range of Apple's target market, and given Apple's push in that direction, it's liable to be commonplace in a couple years anyway.