Do you know about FreeMind? It's a free mind-mapping software which lets you do mind-mapping on the computer. One of the cool things you can do is export to XHTML and upload a complete mindmap to your website.

You can use mind-mapping for essay writing and brainstorming, using colors and shapes and arrows to organize disparate ideas; for project management to keep track of projects, task assignment and time recording; for website or blog design to get your ideas organized into categories; and for anything else that requires organizing information.

There's a great step-by-step FreeMind tutorial here.

And here's a screenshot from the FreeMind website showing what a typical mindmap looks like.