Commenting on posts has now been re-enabled. Feel free to comment away!
As a result of tightened security measures we have undertaken, we broke a tool that was very effective at getting rid of tons of automated spam. The only way to get comments working again quickly was either slacken security (not OK!) or abandon that tool, so we made the decision to abandon that spam blocking tool.
Consequently, we're now blocking comments with ANY hyperlinks in them in a not quite as elegant, and somewhat brute force, spam limitation measure.
Other than that, comments are open.