I am doing a PPC-oriented research paper for the travel industry.  In
that context, my question is this:  I am trying to get a best guess
estimate at the number of clicks and/or searches on the keyword phrase
"New York Hotel" during any given day or month through both Google and
Yahoo! properties (estimated total number and breakdown between the
two -- all engines and affiliates powered by each seach engine).  I
have been using Google Adwords' "Traffic Estimator" and Overture's
"Keyword Selector Tool".  Unfortunately, the two companies quote
traffic in different ways.  For example, Google's Traffic Estimator
for "New York Hotel" displays approx. 50,000 clicks (not searches) per
day.  Overture's Keyword Selector Tool quotes 925,992 searches (not
clicks) during the month of November, 2004.  I was thinking I could
somehow extrapolate the total number of clicks based on
Yahoo!/Overture vs. Google market share, but it occurs to me that the
50,000 clicks quoted by Google may also include AdSense (i.e. not just
search engine clicks).  Furhtermore, I can't get a handle on number of
clicks through Overture using just the number of searches data for
November, 2004 that they provide.

Let me see if I can clarify:  I need someone to identify and use some
realistic logic to come up with a total number of PPC-related clicks
that are available for the keyword term "New York Hotel" from
Yahoo!/Overture and Google properties.  I need to view, experiment
with, and agree with your logic.  FYI, the practical use of this
information is for me to define a maximum PPC budget between both
Google and Overture properties for the term New York Hotel.  Google
provides click data, Overture does not.
Generous tip for complete information and verifiable logic that can be
used for other travel keyword terms as I continue my research.

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Clarification of Question by charlesz-ga on 01 Jan 2005 12:24 PST

Sorry -- wrong Subject Line.
Should read "Complex PPC Question Concerning Keyword Stats"

This is Feb 2003, but should give you a start:
http://searchenginewatch.com/reports/article.php/2156461

An other site that could lead you to some good numbers is the Internet
World Stats: http://www.internetworldstats.com/stats7.htm

Have fun!

Check out www.wordtracker.com for a side-by-side comparison for number
of searches in Google and Yahoo. This program does not isolate ppc
clicks, but it can give you a more accurate figure for the number of
searches for your term in both engines.

I do extensive google adwords advertising, and I find Overture and the
adwords traffic estimator to be notoriouly inaccurate. Someone else
mentioned it, and I have to agree...wordtracker at
http://our.affiliatetracking.net/wordtracker/a/12617 is a MUST HAVE
tool. And, they have a free trial that will give you a ton of good
information, if you don't want to pay.
I would also suggest Perry Marshall for tremendous adwords advice,
http://perrymarshall.com/cmd.php?pg=192967. He's known as the gura of
google adwords, and his informative seminars and ebooks saved me the
purchase price in only a few days.