Let your web site visitors click +1 and track it with Google Analytics.
Adding rich snippets for search engine optimization.
In response to Paul Boag's article on SEO.
Duplicate content is fixable, and should be fixed.
“RSS is not without its dangers from an SEO perspective.”
“Making money with the development and distribution of open source software is very possible.”
The why and how of switching to SSL.
“Don’t block your CSS & JS.”
The choices you have and how to make them.
How to mark up pages that have similar content in multiple languages.