There is a collection of free mac video converters to help mac users to handle nearly any file format.
MPEG Streamclip is a powerful free video converter, player, editor for Mac and Windows. It can play many movie files, not only MPEGs; it can convert MPEG files between muxed/demuxed formats for authoring; it can encode movies to many formats, including iPod; it can cut, trim and join movies. MPEG Streamclip can also download videos from YouTube and Google by entering the page URL.
FLV2iTunes is a simple docklet application for converting movies to iTunes,iPod, and iPhone supported format.You just need to drag and drop movies to it and you just need to wait. It will accept any movies format that are supported by ffmpeg (WMV, XVID, DIVX, FLV, AVI, and more), converts it, and insert the movie into iTunes library.
HandBrake is an open-source, GPL-licensed, multiplatform, multithreaded video transcoder, available for MacOS X, Linux and Windows.
Media Converter is similar to ZamZar and vixy.net, but requires you to create an account and log in. Also, it seems like it only supports downloading and converting videos from YouTube. You can also download their video download program, but it only supports 5 sites.
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