Great mind mapping software for iPhone and iPad. Get it for free (for a limited time only) and let them fix any bugs in the future!
Company blog post: XMind for iOS Now Available. Get It Free for Limited Time Now
What's mind mapping? A quick introduction from Merlin Mann: Mind Mapping, and how you use it
Whenever you are confronted by a problem — professional or personal — mind maps help you see all the issues and how they relate to each other. They also help others quickly get an overview of how you see different aspects of the situation, and their relative importance.