I'm using the Recent Comments plugin and Kitten's Friendly Comments, and comments that are awating moderation due to Kitten's plugin still show up in the recent comments section on my blog, even though the title of the post they refer to is missing.
You can see this at http://www.evilblog.net. I made a fake comment from Spammerguy to illustrate this.
I notice that the query for recent comments includes
$request .= "AND comment_approved = '1' ORDER BY comment_ID DESC LIMIT $no_comments";.
I think that the recent comments plugin is not working, because when I change the query to get the comment_approved as well, and then check that before actually outputting text, it doesn't output on the unapproved comments. However, it also doesn't output the number I want in that case, because some of them are thrown away as spam.