We’ve linked to Tony Buzan’s iMindMap software and videos on mind mapping before. Mr. Buzan has published some new videos and articles that might be worth a look if you are just starting to explore mind mapping. The articles lay out the principals of mind mapping and the videos do the same but from obviously a more visual approach.
After we first linked to iMindMap several users here gave it a try, as did I. For what it is worth on a Tablet PC, I prefer using MindJet’s MindManager. MindManager works much more intuitively with a Tablet PC and Inking in my opinion. But remember there are different strokes for different folks, so you might want to give iMindMap a try. There is a 30 day free trial for you to give it a go.