MindMeister has been around for awhile but they have just launched a new and improved version.
They have updated the visuals, you can now share your mindmap via email and twitter, it's easier to use and there are more templates. One of the cool features of Mindmeister is that it can be used collaboratively. Depending on the package you get, you can have a team working on the same mindmap in real time. Mindmeister is now also available for the ipad, iphone and android platforms. Very cool.
Check it out: www.mindmeister.com