nope, portable .ra is either non-existent or rare. There are plenty VERY nice ways to rip a CD to MP3 or .wma..... AudioGrabber (above)might be one of the easiest...or JetAudio....

but AFTER you convert CDs to MP3, some of the programs I noted will make a nice index ON your PC.

(Not sure what your Zen wants...do you just plug it in and tell it to suck up MP3s?) as you know, I had to burn CDs for my) player.

AudioGrabber seems like easiest way right now. (MP3 conversion is built in...some programs you have to download separate LAME file to do conversion...not too hard, but...)