We come up with a Web-Based open Mindmap service called OKmindmap. It supports collaboration, image and video embedding, SNS (facebook, twitter, and Delicious) integration, and conversion to PPT and wiki. Service available on http://okmindmap.com , more information on http://bit.ly/glxIW0 . Your comments are welcomed! This also can be integrated with Moodle as an activity or class header.
Moodle integration is explained http://wiki.modulestudy.com/index.php/Moodle_Activities
Some other activities for Adobe Connect, freemind, and SMS are in http://wiki.modulestudy.com/index.php/Moodle_Activities
Have a fun!