Let me heartily recommend using the Google Chrome or Safari web browser for a smoother commenting experience (and surfing experience too). The near-future version of Firefox will handle our commenting system better too. If you’re really adventuresome, you could even use Opera. But I strongly recommend against using the bane that is called Internet Explorer.
Update: Because of the problems it was causing, we are no longer using the IntenseDebate commenting system. The good news is that all your comments were saved and that the new version of WordPress (2.7) natively supports threaded comments. The bad news is that the threaded connections of the past few posts were lost, so those comments will be displayed in a linear fashion.