Curious about how Picross DS works? Feel like torturing yourself with preview materials for a game that has yet to be announced for the US? We were, and we did!
The European Touch Generations page has a rather nice interactive Flash presentation that demonstrates how to work a Picross puzzle. It describes an aspect of gameplay, demonstrates it with an animation, and then the user can click to the next lesson. Sort of like an animated Powerpoint presentation. At the end of the short presentation, you get a small Picross puzzle.
We actually had a pretty hard time grasping the Picross "strategy" before running this demo. So we can give an honest DS Fanboy Testimonial-- It Really, Really Works!