Yahoo Gaining Subscribers But Google Mail is Threatening

Yahoo does a great job supplementing its advertising revenue with a growing subscription revenue. I like companies that offer valuable free services and then upsell you on additional premium services. I've been using Yahoo email for years and about 2 years ago started paying them $30-50 per year for additional storage space and spam filtering.

But even more, I like companies that offer valuable free services that are supported by other business models.