User Interface stencils
We make flow maps daily to visually represent how users move through a system. We find that maps which depict screens and the results of user actions from those screens are easier for our clients to understand than the long text-heavy documents usually produced during the definition phase of most large web site projects. Most...more
Just a variety of line styles and colors, ready-made. Customize this with your favorite line-styles.
Additional UML diagram tools, esp. for Use Case and Activity diagrams. There is also a Domain object for class domain or namespace groupings in Class and Collaboration diagrams.
Charles Parcell has created a very slick set of stencils for website flowcharting that has just about every component you might use for a site, from Flash to PHP to .Net. And all of them in a unique, colored style. Awesome.