I've switched the comment system on the Primate Labs Blog from WordPress' built-in comments to Disqus. Disqus is a hosted comment and discussion service that offers a lot of nice features; you can "log in" and leave comments with your Twitter, Facebook, or OpenID account (you can also sign up for a Disqus account).
Disqus also enables threaded discussions instead of a flat list of comments, making it easier to reply to one person instead of an entire comment thread. Disqus also (optionally) notifies you when someone responds to your comments, making it easier to follow discussions.
I really hope Disqus makes it easier to have meaningful discussions on the Primate Labs Blog. If you've got any questions or comments, you can let me know by posting a comment!