Google 'reconsidered' discourse.net, but nothing seems to have changed.
In digging around, I did find one weird thing that I am sure is connected to my problem. If you search on google for “link:discourse.net” (a search that should show all pages that link to here) you get … nothing at all.
Since I know there's at least one link to here out there, that is weird.
This happened to me a while back when my site’s index page was hacked with a hidden iframe exploit. I had to go through the entire Google Webmaster resubmit routine to get re-added to the index. The fact that you can see no links probably means that your site has been removed completely from the Google index, presumably for something similar to what happened to me.
And yahoo shows 257,231 inlinks: http://siteexplorer.search.yahoo.com/search?p=http%3A%2F%2Fdiscourse.net&bwm=i&bwmo=d&bwmf=s