We found this birds nest in our tomatoes a couple of weeks ago. We think it is a wren's nest. It has 4 eggs. The mother is on the nest most of the time now and she doesn't fly away even when I'm picking tomatoes about 6 inches from her. There is a whole bunch of tomatoes right above her nest. I have picked the biggest one so that it doesn't fall on the eggs. If you look really close in this picture you can see the momma bird in the middle looking up at me.
(The pictures should all be zoomable now. Not sure what I did different.)