The BeagleBoard project is bringing a new board to the world. The low-cost BeagleBone board will provide Arm power to the embedded community.
It boasts a 700MHz Cortex-A8, 256MB of RAM, Ethernet and USB, but also headers just like the Arduino. The board is not pin compatible with the Arduino family, but will provide “capes” (instead of “shields”) expanding the functionality of the board.