LucidChart - Easy and Free Flowchart Tool

LibrarianInBlack.net brings our attention to LucidChart,
a free web-based collaborative flow-chart application
that requires no plug-ins.

Features include:

A simple interface
Ability to add users to edit a document
Ability to create multiple pages/flowcharts that you can link together
Text that is automatically centered in the image
Ability to export of flowchart as a PDF, webpage, PNG, or JPG file