Ethnographic screencaps

I'm looking for a piece of screencapture software, or a methodology. I want to use it as follows - recommendations are welcome.

I am interested in studying how people use technology, in an ethnographic kind of way. When I visit someone's house, I might take pictures of where the computer is. I might also want to take some screenshots. What I need is a way to make screenshots on pretty much any computer (varying OS's).

As long as it's Windows, I think I can do this: use CTRL-PRT SCR to make a screencap. Open M$ Paint (which is installed on all computers). Paste in the picture and save it. Then either save it on a diskette (most computers) or email it to myself (internet cafe where diskettes are disabled).

Any tips for macs?

# Aug 21, 2004