PPC Testing: Profit by Impression / Click The ultimate metric to understanding your PPC testing results.

AdWords Keyword Research eBook - Take an in-depth look at the new AdWords Keyword tool.

A/B Split Testing with AdWords - Learn the basics of creating and running a split test.

Understand Taxonomies - Directories and tagged information is the cornerstone of information retrieval, take a look at how to organize information.

Crafting and AdWords Account - Overview and analogies for creating AdWords Accounts.

PPC Title & Description Writing - Series of articles on writing titles & descriptions and their purposes.

PPC Bidding FAQ - Rules based bidding has many basic rules, understand them all here.

Traffic conversions: SEO vs PPC vs Press Releases - A sample look at conversion rates by trffic source.

AdWords URL Dynamic Parameters - Understanding and using the dynamic URL paramaters in Google AdWords accounts.