What is the ideal approach for one? Assuming you don't want it to be a public one (to avoid moderation headaches), and you want to avoid automated spam, and your page is a static site, what is the ideal way to incorporate something like that?
I have a static blog with a public comments system using Disqus; it’s just a JS snippet and it works great. I’ve seen people (ab)using GitHub issues too, or even use gists for blog posts.