PC-on-a-stick devices[1] [2] are a nascent but growing market segment.

Things that make them useful for USB Jacking:

• most have a USB-device or USB-OTG port (because most are designed to cooperate with a larger computer like a typical smartphone does; many run Android)
• though they're larger than a flash drive, [1] [2] [3] [4] [5] they're not much larger, and they pack a LOT of power in that small package, much more power than a microcontroller solution provides

Rockchip RK3066

• devices:
  • UG802
  • MK802 III
• SoC USB ports: (note: packaged devices may not expose all of these ports)
  • 1x USB OTG 2.0 interface and 1x USB 2.0 Host interface
• Linux:
  • Picuntu

Allwinner A10

• devices:
  • MK802
  • MK802 II
  • Mele A1000
  • more
• SoC USB ports: (note: packaged devices may not expose all of these ports)
  • 2x USB 2.0 Host interfaces and 1x USB OTG 2.0 interface
• Linux:
  • linux-sunxi.org
  • XBMC

other SoCs

• Samsung Exynos
  • Cotton Candy, from FXI