This is probably of interest to Enterprise 2.0:

Aperture is a Java framework for extracting and querying full-text content and metadata from various information systems (e.g. file systems, web sites, mail boxes) and the file formats (e.g. documents, images) occurring in these systems.

features:

• Crawl information systems such as file systems, websites, mail boxes and mail servers
• Extract full-text and metadata from many common file formats
• View files in their native applications
• Ease of use: easy to learn, easy to code, easy to deploy in industrial projects
• Flexible architecture: can be extended with custom file formats, data sources, etc., with support for deployment on OSGi platforms
• Data exchange based on Semantic Web standards (e.g. RDF, SPARQL, ...)

• Plain text
• HTML, XHTML
• XML
• PDF (Portable Document Format)
• RTF (Rich Text Format)
• Microsoft Office: Word, Excel, Powerpoint, Visio, Publisher
• Microsoft Works
• OpenOffice 1.x: Writer, Calc, Impress, Draw
• StarOffice 6.x - 7.x+: Writer, Calc, Impress, Draw
• OpenDocument (OpenOffice 2.x, StarOffice 8.x)
• Corel WordPerfect, Quattro, Presentations
• Emails (.eml files)