Top site for "xml documents": simplyxml.com

Title: Simply XML Home Page
Description:
Simply XML provides simple solutions for creating and publishing XML content. Our goal is to allow enterprises to take advantage of information standards like DITA, DocBook, S1000D and Information Mapping by providing authors with simple tools for creating valid, high-quality XML from Microsoft® Word. We believe that standards adoption will accelerate when the vast majority of authors who use Microsoft Word can easily contribute content and documents to the corporate publishing system. Achieving this goal will allow efficient and effective reuse of information, single source publishing, document control, and publishing to multiple media.

Approx. monthly SE traffic: 20.06
Approx. monthly SE traffic cost equivalent: $30.1