Watching the astronauts suit up for a spacewalk. You can see it on your cable/satellite system, or online at NASA TV.
There is a HD feed at http://www.nasa.gov/multimedia/nasatv/ustream.html that is actually ahead of my satellite tv system feed! That’s a bit strange to me… the HD internet feed is a split second ahead of the satellite feed, and well ahead of the standard internet feed. If you’ve got a broadband connection, the HD is the way to watch online! Spacewalks are a lot of work, but you get a break beforehand… you just float there while your astro-buddies do all the work getting your suit ready to go! Once you step outside, though, it’s about 6 hours of steady work, and no coffee breaks. Bathroom breaks are a bit different, too.