The Mvix Nubbin is less than 3/4" long and is claimed to be compliant with IEEE 802.11b, g and draft 802.11n, but is not Wi-Fi Certified to any of those standards. It supports WMM QoS and Wi-Fi Protected Setup (WPS) security.
The single-band 2.4 GHz adapter supports single-stream draft 802.11n, so has a maximum connection rate of only 150 Mbps when connecting to draft 802.11n routers.
The product will be available this month for $39.