ASurroca has a sample implementation on bubble map (idea was which invented by Taguchi-san at IDEA*IDEA.). ASurroca has expanded the idea to have some smaller bubbles sticking with bigger bubble to represent the smaller tasks or milestones within the project and the project respectively. He also has some line connectors to represent the relationship between different task:
Hacked Bubble Map

My Bubble Map – [ASurroca @ Flickr]

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