I just thought I'd mention that a couple more tutorials have made its way to to the project homepage.

The first tutorial demonstrates how you can use Ruby DICOM to perform both simple and advanced DICOM data element anonymization, as well as how to anonymize burned in image text. This tutorial has actually been available for some time, so you might have seen it already. Anyway, you can check it out here:

http://dicom.rubyforge.org/tutorial2.html

The latest tutorial demonstrates how you can use Ruby DICOM to make a DICOM Viewer, a graphical user interface (GUI), using purely cross platform and free, open source tools. This tutorial will show you how to make a simple program that displays both DICOM image and data elements, using the Qt4 framework via the QtRuby bindings. Check it out here:

http://dicom.rubyforge.org/tutorial3.html