I recommend iDealshare VideoGo which is a professional CAF Converter.
It can convert all kinds of CAF audio including 6 channel CAF (CAF with 5.1 surround sound)!
Besides converting CAF to MP3, iDealshare VideoGo can also convert CAF to lossless audio like Convert CAF to Apple Lossless ALAC, Monkey’ audio APE, FLAC, WAV and etc. It also can convert CAF to AIFF, AU, RA, M4A, AC3, ACC, WMA, MP2, DTS, OGG and etc.
Moreover, this powerful CAF Converter also can increase CAF audio volume; join several CAF files into one; trim audio segment; adjust audio codec, sample rate, audio channels; batch convert CAF files and etc.
You can find it and a step by step guide on how to convert CAF files at http://www.idealshare.net/caf-to-mp3-converter.html