Tomorrow I have to go and take an RE lesson on Baptism at our local primary school. Part of this will be to debunk the rubbish the teachers have told the children - did you know Baptists are followers of John the Baptist and baptise because he did? No, neither did I!
However, I did find a useful schools website at www.request.org.uk and if you go to www.request.org.uk/main/dowhat/dowhat.html there is some decent stuff on baptism in different traditions, including videoclips (in Real Player), photos and activities. There is an infant school version too with a mildly annoying little squirrel character! (No Andy J, I don't mean a mildly annoying little Jesus character!!).
I also found some nickable short clips of dunkings on a Taunton Baptist Church's website, so a few of them will be used tomorrow too.