"MPEG-4 is fast becoming the most popular video distribution format thanks to the growing numbers of iPod video and PSP owners, combined with all the consumer electronics devices with DivX support. Creating an MPEG-4 file with all the right settings gets confusing, especially with all the options for creating an AVI wrapper file with DivX or XviD, or adding h.264 video to an MP4 container. If what you want at the end of the day is an MP4 file, you need an easy way to get there from whatever your original format happens to be. Command line app MP4Box is a complex and capable app for creating MP4 files, but command line options get confusing, unless you're addressing them from a graphical interface. YAMB provides a graphical front end to MP4Box, creating a sensible solution for joining audio and video files, adding subtitles and chapter markers, splitting or joining MP4 files and getting detailed information about each file." I've been using PSP Video 9 to convert videos over for my PSP for the simple ease of use. YAMB looks to take another great tool and make it more accessible for the masses with a nice GUI.