If you love mindmapping and want a terrific app for your new iPad, iThoughtsHD is my recommendation. Mindmapping enables you to visually organize your thoughts, ideas, information, and research. You can email your maps as pdfs, Freemind, iMindmap, and many others. The email functionality puts your map into a nice looking outline too. It costs $9.99, but is worth every penny.
Here’s a mindmap I created for Sources of Law and Legal Authority: