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Minimal, Easy Dev:

 - Core
    - ARM SoC, probably BeagleBoard-compatible device
    - power management/regulator IC for SoC
    - 256MB RAM
    - No onboard FLASH, 2GB+ uSD card
 - WiFi
    - Atheros ath5k-compatible WiFi bg baseband, radio
    - Antenna connector
    - regulator/powermanagement
 - 802.15.4 
    - all-in-one chip, trace antenna (?)
 - Ethernet
    - PHY IC
    - Single 10/100mbps jack (w/ LEDs)
    - Connectors with LEDs
 - Power
    - 5/12v regulator, ~1amp
    - Power connector
    - Reverse voltage diode
 - Second SD or uSD connector (for expansion)
 - status LEDs and drivers (PWM from SoC?)
 - reset button
 - power switch

"Single PCIe":

 - Core
    - ARM SoC, Freescale i.MX6
    - Power management/regulator IC for SoC
    - 512MB RAM
    - No onboard FLASH, 8GB+ uSD card
    - FRAM chip for routing table persistance
 - WiFi
    - full-size miniPCIe slot for off-the-shelf hardware
 - 802.15.4 
    - all-in-one chip, trace antenna (?)
 - Ethernet
    - GigE switch chip w/ PHY, 5 ports
    - 4x LAN jacks with drivers for longer cable runs (w/ LEDs)
    - 1x WAN jack
 - Power
    - 5/12v regulator, ~1amp
    - Power connector
    - Reverse voltage diode
 - USB Host jack
 - USB mini jack for UART/JTAG/Mass storage (how? USB2 hub?)
 - Second SD or uSD connector (for expansion)
 - status LEDs and drivers (PWM from SoC?)
 - reset button
 - power switch