In regard to using the stacking headers on the motor shield, I think I'd like to assemble the motor shield I ordered a couple days ago with them, but I'm not exactly sure what the best method for assembly would be. In the online instructions at http://www.ladyada.net/make/mshield/solder.html
the headers are inserted in the Arduino for alignment, and soldered from the top of the PCB. If the female stackable headers are used, I am thinking that the header itself will block the top contact, and if they're soldered from the bottom, then they couldn't be aligned perfectly in the Arduino. Without having the parts in my hands, I can't tell just how much of a problem this might be, but if anyone has suggestions for this part of the assembly I'd be happy to hear. Thanks a lot!!