1. SharePoint 2010 introduces a new Managed Metadata Service that allows for centralized storage and management of terms across sites and site collections. This provides a consistent way to organize content.
2. The Managed Metadata Service supports both taxonomies for structured terms as well as folksonomies for user-generated keywords and tags. It integrates with other features like Business Connectivity Services.
3. While powerful, the Managed Metadata Service requires planning to set up terms and administer the term store. Considerations include importing structures metadata, separating terms with commas, and preventing misspellings.