I have designed a development board for the xmega32a4 and wanted some feedback.
The board has 40 pins in a standard 600 mil layout and has a similar design to the om644p - i.e. it includes the AVR microcontroller, USB socket, FTDI USB/RS232 converter, power LED, USB TX/RX monitor LEDs, 3 port I/O monitor LEDs, a 14.7456 or 16 MHz crystal, and a bootloader for easy downloading of software. The crystal can be used with the xmega PLL generator to support up to 32MHz. The board can be powered from external 3.3V source, USB or an external 4.6-18V source via the on-board 600mA 3.3V LDO regulator. Pins are provided so that a PDI capable programmer could be used to replace the supplied bootloader with user code.
The picture below is an annotated Eagle 3D rendering of board - click on it to make it larger. I like this facility of Eagle but note there are only outlines of the mini-B USB socket and the SOT89 3.3V regulator.
All of the available I/O ports (A, B, C, D, E) are brought out onto 32 pins. The remaining 8 pins are used for power, reset/PDI_CLK, TXD/RXD/ATN and are in the "Basic Stamp" compatible format. Notice the 41th pin for PDI_Data which is only needed for reprogramming and not for normal use with the bootloader.