I saw this. Hope it can help :)

http://insightfulnana.com/home-garden/gardening-home-garden/tomato-pollination-how-to-pollinate-your-tomatoes/html

Depending on where you live, your garden zone, it may well not be warm enough for them yet. Mine are blooming too but it simply hasn't gotten warm enough here until just the past couple of days for any fruit set.

If that isn't the case look into things that could be stressing the plants as stress = little to no fruit set in many cases. Over-watering, insufficient nutrients, too much nitrogen, pests, if in containers are they rootbound, etc.

Dave

No worries! I have planted seeds and waiting to see the results. Read that along the way and thought it may help. Hope it all goes well!

I live in central florida so the 20 pounds of sweat I lose everyday outside will attest to the heat. The plants are absolutely huge and gorgeous. No disease. No pests. Hundreds of flowers. Just no fruit. They are in containers but seem to still be growing.

How did you try to hand pollinate?

Tomatillos can't really self-fertilize, they need companions, which you have. How I fertilize mine is I pick a flower from one plant, walk it over to the other plant and rub the flowers into each other. I've found that anything short of that does nothing for me or the tomatillos.

I live in Denver, (z5) and have grown tomatillos for a few years running. The first year, I experienced pretty much the same thing - tons of flowers - no fruit. Eventually, I just stopped paying attention and decided that the plants were attractive enough to leave in the garden and I went on with my summer. Then came August, and one day I noticed there were literally hundreds of tomatillos in various developmental stages. By the end of August, I was overwhelmed with tomatillos. They were on the plant, all over the ground, piled on my counter, and I was running out of ways to eat them. These days I only grow two or three plants, which is just the right amount for me. I generally use them in chili recipes, substituting chopped tomatillos for half of the tomatoes.