This way of sifting through material to categorize via David Bourget is very helpful:

Go to "Material to Categorize" for your category, or just go to the category directly. In the "search inside" box, use a query like this:

@source "journal of philosophy" or use keywords like "neuroethics"

This will show you all the contents under this category that have this source. To see the material to categorize, order the results by category. The material to categorize will be at the top of the
listing. To see the categorization shortcuts, enable this option in the options on the right.

Using this search method can allow you to go through and categorize everything in one area of philosophy or from one journal at a time. Anyway, I found this very useful - hope it helps other editors (especially if you are dealing with a big back-log)