Data Dictionary, are you out there?

A global manufacturing company needs a data dictionary to assist them with maintaining and publishing definitions of business concepts and data elements such as Customer and Gross Sales Amount. This data dictionary needs to at a minimum:

• Be compatible with packages such as SAP (but can also work independently of these packages)
• Incur minimal maintenance cost
• Allow classifying of terms such as by geography or line of business
• Make the definitions easily accessible for browsing through the Web

What advice (both what to do and what to avoid) would you recommend to this company?