The Name Game

There are lots of variations. Here a few that I've found to be pretty effective.

Sit in a circle. Go around the circle, and have each person introduce them self by first name, and perhaps tell a little about them self, such as how long they have been a nudist, or where they live, or something like that.
Sit in a circle. Divide everyone into pairs of people who don't know each other. Give them five minutes to chat with each other, to find out what their name is, what they do for a living, where they live, and what it is they like about being a nudist. After a few minutes, remind them that they both have to find out about the other. Typically, the conversation goes on for a while. Cut it off after about 8 or 10 minutes, and then have the pairs each introduce the other person to the room.
Sit in a circle. Typically, the host starts and says his name. The person at to the host's left then says the hosts name and his own. The third person says the name of the first two, and then his own. Continue around the room, so that the last person says the name of everyone else in the circle first. The host should finish by naming everyone again.
Sit in a circle. Start with the host, who says "My name is X". Everyone then repeats the host's name three times out loud. Move around the circle until everyone has introduce them self.