mp3 join

When creating audio books, it's often useful to join all the little MP3s from a CD in to one larger on. The best (free) too seems to be MP3DirectCut.  

Go the the 'Batch settings..." and use the 'Join' selection toward the bottom. 

There are other tools such as mp3wrap, but they leave tags embedded inside the result and produce files that do not have proper length detection and inability to fast forward in some apps