The environmentalists/organic/natural/hippy people are right about one thing: those new-fangled "earth friendly" orange cleaners, the ones made from orange oil, rock.. as insecticide! (They clean stuff too, but so do lots of things, so no big whoop there)

Spray some on a bunch of ants, and they stop dead in their tracks. Keeps 'em away from the treated area after that, too.

My only misgiving is that it might eat the paint off of my baseboards and the varnish off my floor, considering that you can also apparently buy citrus-based paint stripper these days. We'll see.