If you do any SharePoint work, you need SharePoint Designer. If you're a developer, you probably got it through an MSDN subscription. But is there someone in your company who doesn't use Visual Studio and other developer tools, just some designer-oriented ones? Now that person can have a copy of SharePoint Designer - it's become a free product. Why? There's a video interview that explains the team's thinking on SharePoint as a platform, and making it simpler to build around it.
Download it here, and enjoy!