One of the places you can filter against is the product tags - but there was no way of actually seeing what tags were used on the products shown.
This is now fixed with the addition of a checkbox in the filter section. When checked, the product grid at the bottom of the Nifty Promo Control Panel shows the tags in use against each product.
When checking or unchecking it, you'll need to click the apply filter and recreate product grid button to referesh the product grid.
checkbox added to display each product's tags |