Love the project, and I am regularly using it when I need to draw a diagram.
When selecting an approach for a new diagram it would be helpful to have a gallery on the website with sample images to aid in navigation to the diagramming type to use. Graphviz has something like this on its project website, where there are sample images, and clicking on them will bring up source code (and could navigate to the page where that feature is discussed).
Given the large number of diagram options, some with task specific purposes, this would be a helpful reference.
