I think one area where Wikipedia is not yet faring too well is in the
fine arts section (painting, ballet, architecture, drama, music, etc).
Of course exceptions exist. Just a gut feeling, no time to dig into it
now.
I filled a few gaps myself: articles on Rembrandt, van Gogh, Dutch
Golden Age and a few others in that area were non existent or very
meagre a few monthes ago. This in itself says enough. If these articles
were in a bad shape until recently, it means we are still charting the
tip of the iceberg, we are talking mainstream household name fine arts
in these cases.
If my assumption is well founded, we might discuss how to attract more
Wikipedians from art schools, schools of music and the like.
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A quote from the talk page for
http://www.wikipedia.org/wiki/Wikipedia:Most_Referenced_Articles
"I don't know what it says about Wikipedia (I tell a lie, I
'''do'''
know what it says about Wikipedia), but [[God]] gets only 886 links,
while [[Science fiction]] is linked 998 times. -- Cimon Avaro on a
pogostick
Erik Zachte
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P.S. I checked: the article about Rembrandt dates from Oct 2002, not
exactly a few monthes ago, still Wikipedia was almost 2 years old then.