AGuest: Oh, and BTW (and I know you weren't insinuating otherwise, but just for the record... my house is clean!
Sorry! I'm glad you know I wasn't insinuating any such thing! My ants usually show up when I've let the house go just a little bit -- it takes just a few tiny crumbs of toast left on the floor to lure them in. If you live on a giant ant hill, you've certainly got trouble, no matter how clean you keep your house.