There's no sound for these videos, but I was asked how I do it by a couple of people, so hopefully these go some way to showing that.
Single colour bosnian crochet is just a slip stitch through the back of each loop.
Single Colour Bosnian Crochet:
Single colour shepherd's knitting is just a slip stitch through the front of each loop.
Single Colour Shepherd's Knitting:
The next video is for bosnian crochet with two colours, for Ross who asked a few days ago. This is just one way to do it. I have also tried doing it purlwise, where I crochet from the back of the work in the old eastern style and "float" the colours at the back rather than "carrying" them (which is like extreme trapping in knitting) as I do in this video. I had a bit of trouble keeping the video centred, but hopefully it's viewable.
Basically I just pick up whichever colour I need from the front or back of the other colour so that it traps the colour that needs to be carried behind the work.
Bosnian Crochet in Two Colours: