I've heard this is a new pest down here in the Houston area, and wonder if anyone knows more about them. They seem to gather in such large quantities that they are quite a nuisance. Fortunately I don't have personal experience with them ... yet (knock on wood). Would an organic yard with molasses, etc, be likely to keep them away?
There is an article about them at http://urbanentomology.tamu.edu/ants/exotic_tx.cfm