It is called Black Phoebe and is usually found near water. Its diet is mainly insects.
Sept 29 Update:
The bird is usually by itself in the yard. These days it hangs around tomato plants and
has been drinking tomato juice from a couple of tomatoes. Guess, I also have a natural insect control ...
This picture was taken through a (not well cleaned) window.. so, it is a little blurred.
