If you've noticed something weird going on with our comments today, please don't panic--we're in the middle of a back-end upgrade that is affecting what you might be seeing on the front-end. Without going into the gritty technical stuff, we're upgrading our comments system to some new software that will give us some additional capabilities for moderating comments. It will also give you guys some new features you may find useful--like being able to reply directly to another comment, "like" a comment or flag a potentially offensive comment.
Anyway, what this means for the site right now is that some of the comments to older posts may disappear for awhile as they are transferred to this new system. We should be done with the transfer later today. Thanks for your patience!