After seeing two different commentators comment under the wrong article within a span of 2 days, I went searching for a plugin that would allow me to move them to the right one. It didn't take long for me to find the Move Comments Plugin at "zirona — Open-Source Consulting".

For me, since my blog is at the top level of the domain and not in a subdirectory like "blog" or "wp", it went in and worked like a champ the first time. The path in admin.php, line 28, needs to have "/blog" or "/wp" prepended to it otherwise (or whatever subdirectory you use). The plugin isn't difficult to install and it isn't difficult to use, but it can be daunting because it lists every post and every comment.

If you have people commenting on the wrong post, check it out and see if this plugin will work for you. The alternatives are to either muck around with your database or to manually move each comment (cut and paste, retype, whatever).