Geoff R has posted ten tips here. He says:
"Mindmapping is a wonderful brainstorming technique that can yield great results, and show you ideas that you hadn’t previously imagined. Most people are familiar with mindmapping and its problem-solving potential, but many people do it inefficiently. If you follow these 10 simple tips, you should find your mindmapping sessions to me radically improved."
The original source is credited as Gear Fire and can be seen here.
Thanks to Andrew Wilcox of Cabre.