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Popplet

via www.popplet.com

This is rather nice. Popplet allows you to create postit type resources rather like Wallwisher. Nice and simple, fast and effective from the look of it. It's a shame that you have to log in to use it though.

SpiderScribe

Online Mind Mapping and Brainstorming app. SpiderScribe is an online mind mapping and brainstorming tool. It lets you organize your ideas by connecting notes, files, calendar events, etc. in free-form maps. You can collaborate and share those maps online!

Webspiration

Online Visual Thinking Tool | mywebspiration.com. Webspiration®, the online visual thinking, learning and collaboration tool for students, teachers, and thinkers everywhere. Brainstorm ideas, visualize concepts, organize information and collaborate with others anytime, anywhere. With Webspiration, assignments and work are always available, automatically saved, and stored online. Collaboration and peer review are easy. Everyone you invite creates, edits and comments on the same document. Whether working individually or with a group, Webspiration is the perfect tool for visual thinking, writing, studying and learning.

Creately

Create and Collaborate on Online Diagrams. This is an easy to use online diagramming app that's built for collaboration. Create fast, professional looking diagrams with Creately's large library of objects and easy start templates. Now you can draw anything easily. A fully interactive interface that works right in your browser along with industry standard encryption and redundant backups. No downloads or installs necessary.

Online Diagram Software - Gliffy

Online Diagram Software - Gliffy. "With Gliffy online diagram software, you can easily create professional-quality flowcharts, diagrams, floor plans, technical drawings, and more. Our online diagram editor makes it easier than ever to create great looking drawings."