Major ant problems over here too! Today, we had to throw out most of our pantry, as the tiniest little ants we've ever seen found their way into the kitchen. We sprayed vinegar, and some organic honey concoction, and not many as of tonight.
We can't use Borax either as we have small kids. I'm calling the bug man tomorrow, to see what they suggest. Perhaps spraying the perimeter of the house each spring?
We were so frustrated today, as it took hours to handle, and we had to throw out a huge amount of food. Going to purchase a bunch of Tupperware containers tomorrow to put all food in them. Went shopping today, the stores had no good quality food containers at all! Wished I lived in the states, as you guys have awesome container stores and such, and that would really help out as we have to re organize and put all new food into containers. No more bags or packages, as the ants got right in. Just went grocery shopping last night, so we were pretty peeved....
Good luck to all of those with ant problems, Tiger