GTD Times: How David Allen uses mindmaps

Dean, an architect, wrote to David to ask for detail on using mindmaps in his GTD system.  Here's the whole thread:

Hi David,

I have enjoyed reading Getting Things Done and Making It All Work.  I own an architecture firm in Michigan, and have been implementing your GTD system into my work and life plan.  I am very close to a smooth-flowing GTD process; However, I have one obstacle to overcome, and I would greatly appreciate your recommendation...

I use MindManager 8 as an outstanding tool f...