Swaps?

I've seen several miniature swap groups and I'm wondering how to join one? I think it would be so much fun to make gifts for other miniaturists and to receive some beautiful mini accessories too! :)

Photo from Leslie Shepherd @ About.com

Have you participated in a swap and was it fun? How does it work? Are they by invitation only? Can anyone join? I would be interested in hosting a swap if I knew how to do it...

If you have some ideas or information, please let me know!

Hope you have a beautiful day!
Blessings,
Kathi