Does not work in Ubuntu 10.04.1 LTS with the latest Ralink drivers for Linux.
You might want to edit rtusb_dev_id.c (in the 'common' directory) to add the USB ID for the device since it isn't in the drivers at the moment.
--M86 22:57, 16 November 2010 (EST)
Several people have had luck following the instructions in this link. Working on 10.10 LTS.