I posted a how-to video about språng interlacing at http://www.youtube.com/user/thesojourningspinner. The last while, I've been showing people how to do sprang, just informally as we see each other at guild meetings or fibre festivals and such. Some of the curious folk live too far away from me for us to sit together and go over the skill so it sticks for them. I hope this video will help a little, and I hope to do some more videos as well.
Please overlook the roughness. I could have put this off for lack of a good video camera and lack of polished presenting skills but I thought it was better to get on with it.