1)   Fast Audio Converter 1.2
Fast Audio Converter supports the most popular audio files formats; supports batch conversion, the best audio codecs and ID3 Tag v2. Handy user's interface and a fast conversion speed guarantee the best results even for the non-experienced users.

 2)   All To MP3 Converter 2.0
If you want to convert your WAV,WMA 9 or OGG files to MP3 format, this program is exactly what you are looking for. You can start conversion directly from Explorer by right-clicking on selected files and selecting "Convert to MP3" from context menu.

 3)   Advanced WMA Workshop 2.3
Pretty useful tool with handy interface, allowing you to convert WAV, MP3, OGG, CD files to WMA 9 format, convert WMA 9 to MP3 and OGG, decode WMA,MP3,OGG files to WAV PCM. Also include built-in batch conversion mode and ID3v2 Tags editor.