Pascal Lee and Leroy Chiao

Pascal is out on the sea ice in the Wellington Channel between Cornwallis Island and Devon Island right now (zoom out to see exactly where that is). He's driving a specially equipped tracked Humvee and simulating a pressurised Moon Rover.

http://share.findmespot.com/shared/faces/viewspots.jsp?glId=0e3h8JV5kbk0Bap9IpsiC1IoEGBiiXYxs

The background story is here
http://www.marsinstitute.info/

And Leroy and Miles O'Brien will be doing live commentary on the final launch of the shuttle Atlantis tomorrow. Only 2 more shuttle flights after Atlantis (click on the live webcast link on the left). Liftoff is scheduled for 1330 GMT or 2230 AEST Friday.

http://spaceflightnow.com/