What's required?

Is there an easy way to grab a picture of the game?

Couple things i tried didn't seem to work and it's a difficult game to describe to the non-gamer non-internet traveler.

Well, for a screenshot, press "P". For me the screenshots are black, except for the selected units. If that's the same for you, then try to reduce the graphic quality. That works for me.
Oh, and if you're using a mac, don't try CMD+SHIFT+3, that'll just create a corrupted screenshot.
I don't know how all this behaves under windowed mode, though.

That's odd. Command+shift+3 works fine for me, except for a little glitch with the pointer that made part of it disappear. Other then that, they looked really good.

Perhaps this, too, is caused by a too low framerate. Or by the graphics card (I have an ATI Radeon 9600).

I only had around 5-6 fps at the time, so it's definately not the framerate. Unless you've been getting framerates that are too high. =P