Recently Halfgain released a wonderful ebook which talks about how the most successful affiliates are making money, its named as "Affiliate Marketing Ph.D" . We were among the very first to get hold of this ebook. Good part is that it's absolutely free of cost and you can download it from this link - http://blogprofitz.com/AffiliateMarketingPhD.rar (zipped) or http://blogprofitz.com/AffiliateMarketingPhD.pdf (PDF)

If you are unsure what the book covers then here is the table of contents of this book for your reference.

Table of Contents 
 
Introduction 
What You'll Find in this Book 
Why Listen to Me 
The 3 Principles I've Found Most Helpful 
 
I. Affiliate Marketing 101 
What Is Affiliate Marketing 
Why Affiliate Marketing 
A Few Money Making Guidelines 
1. Branding 
2. Speed 
3. Numbers 
4. Spending 
The Affiliate Strategy Simplified 
 
II. How to Research Your Market 
Step 1: Finding Markets 
Step 2: Think You've Found a Potential Market?
 
Example: How Scott Missed the Boat 
Step 3: Finding The Keywords That Pay  
 
III. Building Profitable Affiliate Sites 
Step 1: Setting up a Commission‐Ready Affiliate Blog 
Step 2: Filling Your Blog with Monetized Content  
Step 3: Monetizing with Affiliate Stores 
Step 4: Affiliate Blog Essentials 
Step 5: Multiple Streams of Income from Your Blog 
 
IV. The Big 12 Marketing Strategies 
1. Article marketing 
2. Free page creation 
3. Video marketing 
4. Classified ads  
5. PPC (Pay Per Click Advertising)
6. SEO (Search Engine Optimization)
7. Forum campaign 
8. Free hosted blog creation 
9. Social networking (social news and social bookmarking)
 10. Link/ad/review buying 
11. Blog commenting 
12. Press releases 
 
V. Outsourcing: Supplemental Section 
 
Final Thoughts