Dear Ken-chan,
Thanks for visiting my Moodle site. Moodle is different from chat or wiki, if fact, Moodle contains all of those functions in itself. Moodle is one of Learning Management System or LMS for short. It can control all aspect of e-learning. I have done a number of Moodle workshops in and out of Japan. If you are interested, I can show you what Moodle can do in detail. Come visit my office when you have time.
cheers,
Hideto