RankWatch: this addon watches the rank of spells you or party members use. If it’s lower than the maximum available, it whispers them or mentions it to you. In levelling my druid alt in 5-mans, I often find it telling people about spells they’re using. A few have replied saying thanks. You can end up having lower ranked spells yourself because of not training both when levelling up dual spec, or because you haven’t updated the spells in your action bar.
Here’s how it looks.