At the bottom of the page there is a key explaining what each color of envelope icon means. It includes special icons for threads with more than 15 replies or 150 views.

Since we don't use that feature, why is it still at the bottom of the screen?

Because I neglected to remove the mention of it from the templates. I'll add that to my ever growing TO DO list

I thought you were one of the idle rich. Hasn't DVD Talk made you enough money to hire an army of programmers?

Here, boy. Remove that script. Chop chop!