As reported in a previous blog posting, I worked astronaut Bill McArthur (NA1SS) on the International Space Station (ISS). The QSL card just arrived in the mail from the ARRL. The back side of the card indicates K0NR, 5 Dec 2005, 1710 UTC on 145.80 MHz Voice.
Information on obtaining a QSL card for amateur radio contacts with the ISS is available here.
73, Bob K0NR