Two fonts have come to my attention that I think are quite good. The first is NeutraFace. The second is Avenir Next.

The former is used in places on the New York Times website. The later is used on the weather aggregator forecast.io. Well done, folks!

http://www.houseind.com/fonts/neutraface/viewfonts

http://www.linotype.com/2090/avenirnext.html