It’s very easy to use, maybe because the interface is really intuitive and doesn’t let you miss anything important on it.
Choose the videos you want to join and the output format, Allki Video Joiner will do the rest. So easy.
And it supports several kinds of forms: AVI(including DivX and Xvid), MPEG I and II, VCD, SVCD, DVD, WMV,... So it will become one of the most important tools for your video times.
Though the most important function of this program is joining videos, you can also use it to convert their format.
The trial version only joins half the file.