For a long time I have wanted to do an interactive lesson on how to plot planes and lines on a stereonet. I finally gave it a go, the interface is very simple, and should lend itself well to extending this to some other tutorials.
The tutorials are:
I gave 10 very short points on how to plot planes and lines (one of them is Enjoy!), please give feedback if you think any are unclear to a beginner! I think the best part about this tutorial is that it goes into 3D at one point, where you can pause, and really get an idea of what that plane means by dragging it around yourself.