Joel Comm just released a free ’secrets to Shopzilla’ ebook about getting the most out of the Shopzilla Publisher Program.

If you’re thinking about using Shopzilla Publisher to monetize your site, this is a good introduction. Contrary to the title, I wouldn’t say it has any ’secrets’, but it does have some insight.

Also, one correction: Joel mentions that the program is “contextual.” Though the ads are relevant (and as targeted as the webmaster chooses), they are not automatically drawn from the context of the page.