I've tried the breathe-right strips, sprays, special pillows, and different sleeping positions. So far only one thing has worked, losing weight. I'm usually a bit on the heavy side, but occasionally try to drop a few pounds. When I'm thinner, the snoring goes away, or at least goes down to a manageable level.
Since I'm the snorer in the household, I usually just let my wife go to sleep a little bit before I do. Once she's out, I can safely fall asleep without keeping her up.
She's got very sensitive ear canals, so plugs won't work for her.
good luck.
-Jeff