Paul Graham is almost always brilliant and I highly recommend his book Hackers and Painters.

Here’s a great essay (and taxonomy!) on how to disagree. The web enables a global conversation, and disagreement will be an important part of that conversation. Of all the forum threads I’ve participated in, I’ve learned the most from the threads that were intense debates, and Graham’s essay shows how to make those debates as productive as possible.

This would also be a nice resource for intermediate to advanced classes.