I subscribe to something called Give Away of the Day (http://www.giveawayoftheday.com), and each 24 hours, they let you download and install software for free that you would otherwise have to buy. A lot of the stuff they make available isn't always crash hot, but today's download might be of interest to you.
It's a media converter that converts the following file types: "WMA, WMV, ASF and other video/audio: WMA, M4A, AAC, AC3, WAV, MP3, WMV, ASF to MP3, WAV, AAC, MP4, AVI, FLV, 3GP, etc." I don't know how good the software is, but a converter I downloaded from this same giveaway promo site at the start of the year has been fantastic.
I just thought I'd let you know about it--you need to download and *install* it (for PCs only, not Macs) within the next 18 hours though.