WordPress.com

This utility is a desktop client for the WordPress services. With its help, you can monitor your websites and blogs, read the latest articles, add new content to your personal page, and so much more.
The application comes as an efficient alternative to using your default web browser to access and manage your WordPress account.

Unlike with the web browser, the WordPress content loads a lot quicker and you can easily switch between website and blog pages, without slowing down your Mac. It also helps you stay focused on working on your website or blog, without dealing with distracting pages (social networking, online video sharing websites, etc.).

Besides helping you manage your websites and blogs, this program also provides you with detailed reports based on your activity. It will also display notifications whenever a user leaves a comment on your blog page, a friend sends a request, etc.

To be honest, I can't find a single bad thing to say about this Mac application. It works perfectly, uses minimum CPU resources, provides you with many useful hints, and is free. So, you should definitely give it a try if you're looking for a simple way to manage your WordPress content.