I am looking for extensive statistics on Pay Per Click (PPC) marketing
for Retailers worldwide.

I need to know these about Retailers:

(1)  How much money is being spent yearly on PPC today and how
forecasts for the future. I want a list of top 1000 retailers (online
and offline who participate in PPC) worldwide.

(2)  Who are the major sub-segments and who are the major retailers in
each sub-segments?

(3)  What percent of their marketing budget is allocated to PPC?

(4)  What is the market percentage for each form of marketing (for
example PPC could be 20% of online advertising that may include
affiliate marketing, banners etc.)

(5) Find out top 10 online retail organizations
(6) Find out top 10 retail conferences
(7) Find top 10 retail related magazines
(8) Top 10 retail commentators / bloggers
(9) Top 10 recommended public relations activities
(10) Top 500 online retailers by PPC ad spend

Your question is about to expire without having been answered and you
might be disappointed.

One possible reason why it hasn't been answered is that you ask
multiple questions on one post. The way Google Answers work means,
that only one Researcher can answer, and only one answer can be given.
When you post multiple questions, if a Researcher has answers to all
but one, they would still not be able to answer it - because they
don't have all of the information you've requested!

If you are still interested in an answer, I suggest that you'll repost
your questions in separate posts.