If this is a new card, you are out of luck, since newer versions use the Broadcom chip set, and Broadcom does not, as of yet, support linux.
If it is an older version of the card it uses the Prism chip set, which is well supported by linux, though not exactly straightforward to get up and running.
You will have to visit the linksys web site with a serial or model number to find out which chip set it is.
If it is the Prism, then you can google for the card and linux and you will find a number of sites that give pretty complete directions; or you can post here again, or you can do a search on linuxquestions for MA311, which is a prism chip set card similar to yours. The directions will be the same.