I finally found a Mah-Jongg game that I can see on my Treo 600, and boy is it a good one; Shanghai Pocket Essentials by LandWare.  Nine tile sets, including easy-to-see Samurai, tons of layouts organized in categories, including smaller layouts called "Quickies" that are perfect for whiling away a few extra minutes (like when your kid is looking for his shoes in the morning.  It's so much more relaxing than yelling ;-) There are two levels of difficulty, four play modes, and a layout editor (which seems like it should be cool, but I can't imagine needing it!)  There's a demo available, so if you like Maj-Jongg games, you should check it out.