I think I figured out how to enable comments without your having to have a Google account. Give it a try if you want.
When you post the comment, (1) Click on the link '0 Comments' or '1 Comments' or whatever the number is. (2) Type your message. (3) Select the option "Name/URL" in the 'Comment as' box under the message. (4) Type your name in the Name field and leave the URL blank. (5) Click Post Comment and it will ask you to type in some sort of funny word. (6) Type in the funny word. (7) Click Post Comment.