...about two hundred miles, in fact.
The NASA website is inviting the general public to send holiday greetings to the Expedition 18 crew on the International Space Station. There are four designs to from which to choose-- an crew member waving during a pause in an EVA ("Wish you were here!"), a gorgeous image of the Earth at night ("View From Above"), a picture of the ISS ("Hello from 220 miles up!") and a CGI depiction of the Martian surface ("Greetings From Mars.")
It's a pretty nifty interactive feature-- once a user picks a postcard, it flips, revealing a text box in which to type a message and fields to include a name and hometown. You can also choose a stamp from five different images.
In case you'd like to greet the crew by name, the members of Expedition 18 currently on the ISS are: Commander Michael Fincke (USA), Flight Engineer Yury V. Lonchakov (Russia), and Flight Engineer Sandra Magnus (USA).