The good news is that closer inspection of our tomatoes shows they are infected with early blight, not late blight.  Notice the yellowing of the leaves and (not pictured) the absence of problems on the stems and fruits.  Although both are fungal diseases, early blight tends to be less devastating, and I'm having very good luck keeping the fungus in check with my blight control measures.

The bad news is that early blight tends to stick around after it shows up.  Unlike late blight, which needs living tissue to survive, early blight can overwinter in plant debris or even in saved seeds.  Although it pains me to remove biomass from the farm, we'll continue to take our blighted leaves to the dump.

This week, I ripped out another three tomato plants that showed too much damage to save.  But I can't complain, since the tomatoes have been pouring in.  Here's our August 6 harvest:

Then skip ahead a few days to August 10, and you'll notice I had to upgrade to the bigger basket:

No photos of the next few harvests, but suffice it to say that I'm now harvesting large masses of tomatoes three times a week.  We've already frozen a gallon of pizza sauce and three quarts each of spaghetti sauce and tomato-based vegetable soup.  When the peach leather comes out of the automotive dehydrator today, I plan to replace the fruit with a batch of sun-dried tomatoes.