WriteMaps is a basic Web sitemap outlining tool. It's low-frills but produces nice-looking sitemaps, good for planning out the architecture of your site. You start with a single page and build on it using the plus or minus icons on each new page. Branches can be collapsed easily. You can switch to an outline view instead of the icon-based view and zoom in and out with a slider bar.
And that's about it. Sitemaps can't be exported to any format (XML would be nice) and can't be downloaded. You can only print. In theory this might be a nice way to share sitemaps among team members, but there aren't any annotation or markup tools. This is clearly aimed at less technical users as developers, who are used to more complex tools like Visio, may feel limited. However, less technical users may enjoy the straightforward functionality.