There's a screen grab utility on your Neo (at least on the more recent builds) that I found by reading through the build tree. It's at /usr/bin/fbgrab. It might be useful for showing off screen images to your friends or for submitting bugs.
To grab the current screen image, just ssh over and run "fbgrab filename.png". The home page for this utility is at http://hem.bredband.net/gmogmo/fbgrab/. I'm not sure how or where this should be documented in the wiki. Also - if you are interested in how the GUI / Window Manager starts up, I've tried to start documenting it at http://wiki.openmoko.org/wiki/Window_Manager_Startup
