Online Mind Mapping: MindMeister - free web-based collaborative mind mapping software for brainstorming and project management.

What is it?
Bubbl.us is a simple and free web application that lets you brainstorm online.
Why use bubbl.us?
Because you can:
  • Create colorful mind maps online
  • Share and work with friends
  • Embed your mind map in your blog or website
  • Email and print your mind map
  • Save your mind map as an image
    Below is an example:

Text2Mindmap (Text 2 Mind Map) is a web application that converts texts to a
mind map. Text 2 Mind Map takes a structured list of words or sentences, interprets it,
and draws a mind map of them.

Generate Mind maps and embed on your wiki

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Work collaboratively on your project! Invite one or more other people into a group. You will all be able to edit the same project and each save your changes. Sharing your project will mean that a group of you are working on the same file. If you just want to send your project to someone rather than collaborate with them on it, use the Send feature instead.
Please note that you can only work on the project one at a time, if the project is already open, you need to try again when they have finished.

Gliffy is a simple to use online drawing package. You can make house plans, flow charts, organisers, garden disigns.... but you only get 5 free pages per login, so its limited unfortunately. (You could keep changing your login I suppose).
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With Gliffy online diagramming software, you can easily create professional-looking flowcharts, diagrams, floor plans, technical drawings,and more!
It's easy to use and Free

Mindomo is a versatile Web-based mind mapping tool, delivering the capabilities of desktop mind mapping software in a Web browser — with no complex software to install or maintain. Create, edit mind maps, and share them with your students, colleagues or friends.
The URL: http://www.mindomo.com/