Gliffy: Slick, free, basic drawing tool a la Visio. Online and done in Flash. If you need to bang out a flowchart, or some basic UML, this is a pretty nifty option. Of course, you get a good helping of Web 2.0-style document collaboration features, allowing Gliffy users to share documents with others, allow them to edit, and keep track of document versioning. The best feature?

The ability to embed Gliffy-hosted images on your own site.

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