With mpTrim, you can remove the silence or unwanted parts of your mp3 audio files. You can adjust the volume level (manual or normalization) and fade in/out MP3s.
And all this keeping the sound quality intact, it works directly in the mp3 format, without decoding/re-encoding, so the file remains the same. And just in a few seconds.
In short, a really good program that will make easier our tasks when editing our mp3 files,... and it is free.
Use mpTrim to improve your MP3 collection.