One thing I do a lot is View Source. It throws up some interesting information sometimes.

At sixapart they are pimping what they offer in the face of an excellent WordPress 2.7. The link to the post popped up in a feed so I go to look. Scrolling to the comments I see one comment that presumably stayed because it has a bit of a pop at Akismet.

It’s a pity the author url was not checked – it’s a spammy comment.

I View Source and to get to the comments I look for the author of the comment – Penny. ctrl-f for penny and there is nothing. Paste the whole lot into Smultron and search for Penny and Akismet. The comment does not appear. There is a lot of what I assume is javascript where I think the comment block should be.
Rewind to January 2008 and another post on that same blog. Check for a commenter name, search the Source and it is there. All the comments look just as you would expect.

Why wrap the comments out of sight of search engines? Not prepared to link back? And why hide the comments like that when you have confidence in your own product to block spam? (And why on earth have comment moderation when a link like that can get through?).
And why have Recent Comments in the sidebar when you never show them on single post views?