As Geoff writes, Drupal provides core taxonomy management capabilities and integrates these capabilities with auto-categorization services such as OpenCalais. Publishers can now easily enrich their content with semantic terms and categories during various steps of the publishing processes. This is essential as with any application of this type it is important to have the functionality align with the work process.

Geoff goes on: "With semantic markup embedded in the content stream, a Drupal-powered publishing environment can optimize search results, organize content for faceted navigation, and make information "more intelligent" for access and distribution. Third party search engines, syndication services, social sites, information aggregators, and other content-aware web applications can recognize the metadata tags and use them as signals within their own environments to filter information for their particular audiences. Mobile web apps and native mobile apps (including ebook readers) can easily render the Drupal managed content."

I would encourage you to download the free white paper. It covers four key capabilities that Drupal enhances: metadata management, semantic enrichment, publishing workflow, and distribution across the web. These is a rich set of advice within it, especially if you want your Web content to get noticed.