MP3DirectCut. A lossless MP3 audio file editor which lets you do the editing without having to decompress to .wav or whatever. It also includes an MP3 recorder which grabs audio from your audio input socket, which is kinda useful. A nice alternative to Audacity to keep around.
mp3DirectCut is a fast and extensive audio editor and recorder for compressed mp3. You can directly cut, copy, paste or change the volume with no need to decompress your files (e.g. to wav format) for audio editing. This saves encoding time and preserves the original quality, because nothing will be re-encoded. The built in recorder creates mp3 on the fly from your audio input. Using Cue sheets, pause detection or Auto cue you can easily divide long files.