(No doubt by choosing that title I've exposed by my blog to death by spam filter. Although if the ones with titles like "Increase your performance with JTS!" got through, maybe I'm ok.)
The Kungliga Tekniska högskolan in Sweden (isn't Unicode wonderful?) is offering a course on GIS Architecture. I was happy to see that they're using JTS as a tool for exploring the DE-9IM spatial relationship model, and also as an example of a Open Source geospatial library.