Wikimedia Bugzilla is closed!

Create a new tag to be embedded in the main article text which reads "as of
{current year}" so that the year value increments based on age of a hidden
creation timestamp.

For example, "As of 2006, the Empire State Building is the tallest building in
New York City."

An [[AsOfDate]] tag automatically generates the text "as of {curyear}" in the
article.

When a [[AsOfDate]] tag is imbedded in the article, a timestamp is recorded. 
Each time the the yearly anniversary of the tag is reached, the article is added
to a list so that the entry can be verified as still true.  Or, any authors that
have edited the article are emailed.

Additional formatting could be provide via some standard text flags.  To have
the tag read, "as of July 26, 2006", the tage could have the format
[[AsOfDate:DateYear]].