After checking the Groove Access Point for remote access to my computer running Groove Workspace resolved the last missing link: exposing a Web Service for a custom Groove Tool. This means that any Groove tool can be queried from a remote location (from your PocketPC for example). Paresh Suthar thinks what I'm thinking:

The more I thought about this, the more I started to see what could be a paradigm shift with respect to content creation and publication. Tim demonstrates how to take a personal activity like blogging and shift it into a group activity so that multiple people can contribute[...]The paradigm shift mentioned above could allow for Groove to be used as a staging facility for publication, from which content is read/written by groups of people

Check here for my facility for publication.Thank you Hugh for a hint I really needed.

Hugh wants to list files from Groove in a treemap and asks whether that's easy to do using Groove Web Services and PHP...Yup, very easy, besides the treemap, 8-). Check here for a sample PHP-class using NuSOAP. Good stuff, those treemaps, would indeed be a nice way to present Groove-data.

Check Smartmoney's Map of the Market for an example of a treemap.