I just downloaded iTunes Windows the other day as soon as it came out, and promptly began ripping all my CDs into AAC and converting my existing MP3s. But now I am left w/ something of a dilemma. I will be getting an iPod soon, but I'd like to keep an archive of music on my computer rather than put everything on the iPod. As it stands, I have an MP3 and and AAC version of most of my music. I already know I'll load only AACs onto the iPod. Now, does it make more sense to stick with MP3 for the songs on my computer, or would AAC be better? Is there any way to convert AAC to MP3 in case I need to send a song to someone who doesn't use iTunes? I am somewhat hesitant to delete all my MP3s and leave only AACs on my HD. Any advice would be most appreciated.