Where can I find some affiliate marketing statistics?
Statistics related to the size of the industry, sales, number of advertisers, number of publishers, growth, etc. would all be helpful. Anything related specifically to travel would be great.
Tags: 
adsense
advertisers
Affiliate Marketing
Amazon
amp
blog
Blogs
commerce web
credit cards
ebay
e commerce site
e commerce software
e commerce website
Email
Facebook
Google
Internet Business
Internet Marketing
ISP
job
laptop
marketing
money
My Space
paypal
Pay Per Click
photos
quot
search engine
Search Engines
SEO
shopping
shopping cart
templates
thanks for your help
thanks in advance
traffic
Twitter
web design
web designer
web host
web page
web pages
web traffic
yahoo
Here is a great place to start:
http://marketing.about.com/od/affiliatemarketing/
You may also wish to contact a few of the affiliate marketing aggregators (Clickz, etc) and simply request the numbers. They are usually willing to share some of the information if they believe that it will help them make the sale to your organization.
Hope this helps!
at the actual aff sites. Cj has a plethora of tools to see payout for different affiliates and such. Go to the actual sources for the best info and turn that info into your stats.