isnt transcoding between lossy formats a really bad idea?
i'm not advocating using wma (or indeed mp3) but once something is encoded you're better off installing the codec and using it as it is. unless you can re-rip from the uncompressed cds.
do a search for mplayer, which is a media player for linux/unix/anything, you dont need to use it but they have a zip of as any codecs as they could find, install that and itunes will be able to cope with wma.