This addon shows a Data Broker with the number of epic items (and items of other quality) that you are wearing. It requires a Data Broker display (like ChocolateBar) to work.
Currently, this addon also allows you to toggle whether to show each individual quality (so you can exclude poor quality items if you like). You can also choose to show a 0 if you have no items equipped of a specific quality or you can only show qualities that are currently equipped.
Thanks to Crindappy@Bronzebeard-US whose addon FuBar_EpicCountFu was the inspiration for this one.