This works for most screenshots. I don't know about games.
On the keyboard just use FN+Shift+C
The Zaurus will make a "camera shutter" sound and if you have an SD card inserted,
it will place the screenshot in "Screen_Files" folder in the root of the card.
If you have both a CF & SD card inserted at the same time,
the screenshot file will go into the same folder on the CF card.
For some reason, on my C3100, the CF card takes precedence over the SD card, and screenshots go there instead of SD.
This is in the manual that StreamlineCPUs sent with my C3100.
You can download the startup guide here:
http://www.trisoft.de/en_c3100howto.htmhttp://www.trisoft.de/download/C3100-2005-06-27-12-00.zipThis manual is for C1000/3000/3100
Trisoft and StreamlineCPUs are partners, so the manual is the same as the one I got with my C3100.
Jon
EDIT: you answered your question while I was formatting my reply.