iWisoft Free Video Converter
Its 100% free, no catches, no trials, no bullstuff. I use it all the time. It supports just about every filetype you can imagine, and you can do batch jobs and change settings, or add overlays, etc.
It is the best thing ever. The website and the name of the product doesn't do it justice, I recommend it. I've used it for many video projects. The Taking Of Isar Tower for example, was filmed with Fraps to AVI, and then I used it to convert to MOV for editing and smaller file size.
(just opened it and checked, it supports 3 types of VOB)