Hello,
Eddy of whighthobbies.net and I created the bahbots controller. There is no special purpose that the board was intended for but rather a general purpose controller board with the ATMega1284P that a hobbyist like our selves would like to work with. We also added the SD socket and xBee socket because it was little extra cost and very useful.
While we have mostly written code for this board with the Bascom-AVR compiler we also did some tests with arduino and WinAVR. At this time I think I will start looking into updating the bootloader and additional support for working with the current arduino IDE.
The main reason for choosing a 18.432MHz crystal was its the highest supported speed on an AVR that is Uart boad frendly. There is no reason a user cant change the crystal and this is also why we choose using a throw hole part for the crystal so that it could be easily changed.
If there are any questions or comments on the BahBots controller I would love to here them...
-Glen