TEI by Example is a wonderful resource. While I have never used it directly in a workshop on TEI, I invariably refer people to it, and have consulted it on occasion myself as needed. So, well done!
On the principle that no good deed should go unpunished, however, it would be great to see it expanded a bit. In particular, a section on transformations, or on using the TEI stylesheet templates, would be a terrific addition. This stage in the process of text encoding remains, I think, the greatest bottleneck to new users. TEI XML is not particularly complicated and is easy to teach; XSLT, on the other hand, can be very difficult, and the TEI stylesheets are not presented in a particularly "user-friendly" way. It would be enormously beneficial to TEI noobies to have a resource that answered the inevitable question: "Ok, I have a tagged text. NOW what?"
In any case, as I say, well done!