There are many options when it comes to handling comments on a WordPress blog. You can certainly go with the default commenting system, you can enhance it with a variety of plugins, and you can even replace it with an entirely different commenting system, like IntenseDebate, Disqus, Facebook Comments, or Livefyre.
At Weblog Tools Collection, we use the default commenting system with Highlight Author Comments added in to highlight the post author’s comments (of course). I prefer to stick with the default comments myself, but have used IntenseDebate on sites that need a bit more. What do you use, and if you’re using an alternative commenting system, what led you to the one you chose?