I think the Norwegian guys at Cotton Candy FXI-Tech actually kind of invented the HDMI stick market, when they first showed a prototype of the Cotton Candy exactly a year ago in November 2011. Since then, tons of other ARM SoCs have been shown and released to the worldwide market:
January 2012: Allways Innovating shows OMAP4 on HDMI Stick (not released yet as far as I know),
March 2012: Telechips Cortex-A5 ultra compact HDMI sticks (2, 3) appears (probably still the most compact)
May 2012: The Allwinner A10 Mk802 appears, has taken most of the market, appearing for $74 but now available for $25 from Shenzhen, a version is $40 with free worldwide shipping in the ARMdevices.net members store.
June 2012: Geniatech shows AmLogic single-core Cortex-A9 in HDMI Stick (available for $49 with worldwide shipping in the ARMdevices.net members store)
September 2012: RK3066 is ready for dual-core HDMI sticks
October 2012: The dual-core AmLogic MX HDMI stick and $99 with worldwide shipping the ARMdevices.net members store).
More RK3066 HDMI Sticks shown, the one with Bluetooth, mini-jack audio out and female HDMI port selling for $60 including worldwide shipping the ARMdevices.net members store.
And now perhaps the most powerful HDMI stick on the market is the i.MX6 Quad-core HDMI stick (2), available for $89 including worldwide shipping hopefully starting later today on the ARMdevices.net Members Store.
Read the full review of the Cotton Candy FXI-Tech HDMI Stick with many pictures here: http://blog.laptopmag.com/cotton-candy-tested-fastest-pc-on-a-stick-can-take-over-any-screen
Re-watch my overview video of the latest HDMI Sticks from Shenzhen: