Open your Unprocessed Tasks view in Trog Bar by clicking on the link labeled “Unprocessed Tasks (##)” This opens a view showing all the tasks you have collected or triaged.

The number next to the “Unprocessed Items” link tells you how many unprocessed items you have:

You can also click the large task selector button in the middle of Trog Bar (just above search) and select Unprocessed Tasks.