- Added example of an Atom feed. ...

- Cleaned up positioning of "layer" labels in architecture diagrams.
- Updated Atom spec reference to current version (1.0).
- Said a little more about ebXML and added a reference.
- Rewrote introduction a little.
- Used "approach" rather than "architecture" as a general term.
- Reverted to proper British spelling :)
- Removed a redundant paragraph about Semantic Web.
- Expanded description of RSS slightly.
- Removed discussion of Atom design objectives --- not that relevant.
- Retitled main section about our approach.
- Tweaked several miscellaneous bits and pieces.
- Further revamped Future Work section.