The format filter in Discover is currently sorted by number of items in the filter (i.e. largest amount is Books, smallest is Book+Cassette). This is NOT intuitive for searching - if I want to apply a format filter, I'm going to look for the name of it alphabetically, not by how many items I think might be available in that format. With the addition of custom TOMs, this is even more important as we are adding more formats available to filter by.