I read about the Terro on the internet last night. It's good to know actual people who have tried something and know it works.
About the cinnamon, does it take awhile to work? That was the first thing I did yesterday when I saw the ants and it didn't seem to faze them at all. They actual walked through it and made little paths.

This morning I didn't see ants there, but the pet food bowls were empty, so I don't know if it was the cinnamon or the lack of food that was keeping them away.