#3 - don't be afraid to admit that you don't know their name. remember everybody has the problem so ask if you can't remember.
super trick #4 - get students to introduce themselves later in the day. i just recently discovered this little trick. right after lunch, do a quick name check. it will help both you as well as your classmates who are trying to figure out who everybody is. if the course is a two day course, i always do it first thing on day two.
super trick #5 - make use of name tags. if nothing else works, why not? i was once on a whitewater course where the 