Now this is more like it! While I only half-recommend DS Puzzler for fans of Picross, Illust Logic fits the bill nicely.
The interface, the puzzles, even the background music are well done and compare favorably to Picture Puzzle on Neo-Geo Pocket. There are 300 puzzles in 10x10, 15x15, 20x20 and 25x25 configurations. A helpful square counter as you draw is a nice touch and the interface is clean and very import friendly.
My only complaint is that the stylus control is awkward, but once I played with the D-pad I had no problems.
Overall I enjoyed it. With better stylus control and some multicolored puzzles Illust Logic would be a must buy. Still, I recommend it if you are looking for a new puzzle game.