I have been working on keeping the Wikipedia web site up-to date on some metadata issues. Here are some of the Wikipedia articles I have either authored or edited.
Semantic spectrum
ISO-11179
Representation term
Metadata
Oracle metadata
NIEM
Classification_scheme
Data element
Data element definition
UDEF
For a complete list you can check out my "User Contributions" page:
http://en.wikipedia.org/wiki/Special:Contributions/Dmccreary