In reply to Keith Davis.

Pretty much.

There is the WordPress foundation which is a non profit organization that furthers the mission of the open source project known as WordPress http://wordpressfoundation.org/

Then, there is the self-hosted, open source, project known as WordPress. It's what you download and install on webhosts from WordPress.org.

Then there is WordPress.com, a service owned and operated by Automattic of which Matt Mullenweg is the CEO. WordPress.com earns revenue primarily from upgrades users can purchase to enhance their blogs. As a company, Automattic earns revenue from their services, VIP platform, and a very small amount through advertising.

Matt Mullenweg is the co-creator of the open source project known as WordPress, CEO of Automattic which operates WordPress.com, and chief board member of the WordPress Foundation. Every now and then, he leads a release of WordPress.

As you can see, Matt wears many hats and in my opinion, has done a very good job of balancing each out separately to avoid controversy.

This explanation may or may not have helped you but at the very least, you can see why there is so much confusion. It's not hard to figure out who's who but it sure is hard to remember.