hi, i've done a comparison. direct rips of wma and ogg files. w ma is the biggest, then mp3, then ogg. there isn't much of a difference though. with the latest ogg dll's in my cdex, i played with bitrates. w ma at lower bitrates is quite electric, mp3 is just as bad. ogg is the best for lower bitrates, making it the smallest format for same quality music, w m a the largest. there was a site that did comparisons as well, but i can't find it. once i do, i will post to the list. brandon