No, I'm building it in Django. I have been looking for a well-defined project to build, and this ended up being a perfect project. It's inspired by HN, and to everyone here it's a clone of HN, but most educators who end up using the site will probably never know HN exists.

It's a completely open project, and if things go well I'm going to write a Django tutorial based on building EN. I'm going to write the tutorial as part of another project I started this year, http://introtopython.org. It's been a busy year. :)