My non-technical sisters know what RSS is and use Google Reader to watch blogs of family & friends. I couldn't believe it when my sister first mentioned RSS or Google Reader, I remember exclaiming "You know what RSS is?!"

I bet if someone made a sports oriented RSS reader a whole lot of people would use it. Some people like going to <= 10 sites to see what's new but people who follow more than 10 sites would like the idea of RSS.