JimmyL has again updated his Puzzle game for the DS:
Another quick update this morning. I changed the touch code again, this time it doesn't register an initial touch until 2 frames of touch are near each other, then it starts lagging the input by 2 frames to avoid any bad touch points when the pen is coming off the screen. There are still some not too common problems when the screen is lightly scraped, but this seems to work well for normal use.