Yeah I don't feel like it's particularly useful for use as an iPhone. I can see the touch screen table itself being very useful for meetings, explanations, diagrams, et cetera, but as for the specific iPhone related question... I suppose I'd probably try to think up ideas of things to do with it. I'm sure there are some apps that would be awesome to use on an entire table. Blackjack apps maybe? haha.
At any rate, I like the touch-screen table technology. But you should be able to cover it with a table cloth, turn off the touch screen, and use it as a normal table for whatever you want (as captain said, nailing your girlfriend?), and then change it back when you want to.