there's also the Spark tablet from KDE: http://www.youtube.com/watch?v=e3wzP34O_48
7 inch, 800 x 480 pixel display, a 1 GHz Amlogic ARM Cortex-A9 single core processor with Mali 400 graphics, 512MB of RAM, 4GB of storage, and 802.11b/g WiFi. 2 USB ports and an HDMI port.
i would be more than happy to run pd on this tablet!