I have managed to setup this Wifi adaptor
download these 3 files
Realtek driver - from "http://www.electrictea.co.uk/rpi/8192cu.tar.gz"
Realtek firmware - from "ftp://ftp.dlink.com/Wireless/dwa130_revC/Drivers/dwa130_revC_drivers_linux_006.zip"
Initialisation script - from "http://dl.dropbox.com/u/80256631/install-rtl8188cus.sh"
copy all 3 to your SD card
start Pi
login to root
type: sudo /boot/install-rtl8188cus.sh