Great graphic from SEOmoz on understanding the SERPs (search engine results pages).
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Ever wondered about the most effective way to use the Google Keyword Tool? Komarketing Associates has a great post about getting the most out of this free resource.

"First, you need to name your action and specify how the lead will be classified.  The name you choose is unimportant but you must make sure you designate the action as a purchase/sale out of the dropbox.

Next you will come to the code generation page.  When tracking a lead or a page view you usually just skip this page as no custom values need to be assigned, but here we need to take special note of the revenue box.  For static actions (such as an account subscription for $9.99 or any other action that has the same value created for each instance) you  can simply type in the price of the action.  Here we would be telling Google that every time we convert we generated $9.99 in total revenue – easy."

Check out the full post complete with screenshots.