Looks a lot like Septoria. Take off any leaves that have the brown spots. They'll most likely be at the bottom. Bag them up; don't let them lay around the garden and don't compost them. Next, get Bonide copper fungicide spray, or the equivalent. Spray all your tomato plants although try not to hit the blossoms too hard. Get the underside of leaves as much as possible. Try to do this when you have a few days without rain, so it won't wash off. Best to do the spraying near the end of the day, or very early so it'll dry before the sun is too hot. I have septoria here; I've found Post Office Spoonful is a good tasting small cherry that grows so fast it outgrows septoria and doesn't seem too much affected (blossoms don't abort, for example). Dotson's Lebanese Heart is another that keeps on producing through Septoria.
Nan
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