I came across this well thought out, on-line diagramming tool.  It allows you to chart out UML, flowcharts, networking, floorplans, etc.  One cool feature is that the diagrams you create can be saved online in a free account. 

You have to wonder how long this will be free as some of these can beginning to build terobytes of data for the company Gliffy.  I thought the publishing capabilities to the web, printed or output to SVG, JPEG or PNG formats all done in Flash 7.

Visit http://www.gliffy.com to see this great application

ON: Gliffy a Visio Alternative via @jpenabickley