Nothing, just name, address, tel, email etc.
Keep it slightly mysterious and stand out from the crowd that seem to love a job description, you know the score -
Senior Executive Vice President in Charge of Market Strategy & Development
When I see something like that on someone's card it tells me all I need to know about them............
Of course a lot of pricks are impressed when they see something like that, and that tells you all you need to know about them as well.......