Which is the most useful mp3 converting software?

[emubrevissugs]

yes...been turning crazy cos somehow these types of friggin programs demand a f-in codec to work with wav-files. 
so that could someone please, please, please inform me which mp3 converting software to get that can help me convert wav renders straight from live to mp3. A people told me that mp3 convert is good, however I am not sure.
in my opinion i dont know the reason the engineers at ableton didn¡ät attach the possibility to render straight to mp3...do u?