FLV to AVI MPEG WMV 3GP MP4 iPod Converter
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Full user review
"Does a nice job, but isn't really free."
Has a lot of file extensions, and seems to do a good job. I had the audio quality change once in the middle of the video, though.
Not actually free. You can get a 30 day version that will convert 1 minute worth of video. Otherwise you have to pay to upgrade.
Also, the interface is not quite obvious. The destination file extension box is called "Profiles" for some reason.