#1 MP3 Cutter Joiner 

MP3 Cutter Joiner is a powerful and easy-to-use audio editor, which builds audio cutter and joiner into one. Supports MP3, WAV, WMA and OGG format. Supports batch cutting. Cutting/joining in high precision and no quality is lost!
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MediaJoin 

Easily join / combine all popular audio and video formats into a single merged file. Formats supported include MP3, WMA, WAV, OGG, AVI, MPEG-1, MPEG-2, and WMV. Optionally include audio tag information for the combined output audio file.
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