Screen Giant is a project to provide free, high-quality worship projection software to churches and schools, using either multi-screen or single-screen operation.

It is currently in a pre-release state, and just about has the necessary features to be useful for single-screen operation.  Still, progress is good, and a more complete version is expected to be available by the beginning of 2006.  Until then, you can download the latest pre-release version to see how things are moving along.