Match.com, believe it or not, back when the service was new. She saw my pic and wrote to me. We wrote back and forth for about a month before we met in person.
We've now been married for almost 5 years now, have an awesome almost-2-year-old son, and another baby is on the way. She's probably the best wife I ever could have asked for, and she's probably the best mother I've ever seen.