I suspect that like myself, many EYB members like to go though their EYB book indexes and count how many recipes they have cooked from a particular book. From earlier posts, I also think that a some members have set themselves targets to cook a certain number of recipes from particular books.
I think it would be great if there was a symbol (e.g. an oven, or a different coloured star), on the same line as the star ratings, which would fill when clicked on, so that it would be very easy for each EYB member to see which recipes they have already attempted from each book on their bookshelf.
I know that you already have a massive 'To Do' list, but I would be interested to hear if other members think that they would find this feature useful or not.
I currently use a bookmark to list my cooked recipes, but I personally think that seeing this information via each book index would be extremely useful.