WordPress is a state-of-the-art semantic personal publishing platform with a focus on aesthetics, web standards, and usability. What a mouthful. WordPress is both free and priceless at the same time. More simply, WordPress is what you use when you want to work with your blogging software, not fight it.
Pros: WordPress is open-source, easy to install, and completely customizable. The members of the WordPress community are highly supportive and responsible for the extensive documentation and support forums. MacManX.com is proudly powered by WordPress.
Cons: None significant.