Free WMA to MP3 Converter
Full user review
Easy to use, intuitive, has a confortable feeling. It does all I need from it and it's free. It's the only REALLY free application I've found to convert ASF to other formats.
When you need to cancel a conversion, it enters in an infinite loop and doesn't close the conversion window, so you must exit the program and restart it.
It's ideally adapted for your needs if they are like mine: simple.