I bought a TP-Link 300Mbps High Gain Wireless N USB adapter (TL-WN822N) today (20110813).
I plugged it into my Ubuntu 11.04 (64-bit) desktop system and disabled all other network connections.
The system recognised the new USB adaptor and began using it. Initially it said I had a 6Mbps connection, but soon ramped up to 117Mbps (see below). No configuration effort was required other than what I have described above.
An iwconfig produces:
wlan1 IEEE 802.11bgn ESSID:"Android" Mode:Managed Frequency:2.437 GHz Access Point: 00:60:64:33:9C:56 Bit Rate=117 Mb/s Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=70/70 Signal level=-5 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:74 Missed beacon:0
As you can see, it has a WPA2/PSK encrypted, 117Mbps wifi connection with my Netcomm "N300" ADSL2+ modem / router.
Bus 001 Device 009: ID 0cf3:1002 Atheros Communications, Inc. TP-Link TL-WN821N v2 [Atheros AR9001U-(2)NG]
The network seems to stable and very fast. I haven't tested all the finer functions, but for connectivity it's at least as fast as my 100Mbps ethernet wired connection.
Posted here so Google can find it.