Hacker News Reader

I believe that is due to the work they explain in this blog post: http://blog.typekit.com/2011/07/26/new-from-typekit-improved...

This and the fact that Jos, the Museo designer, has always been very web-oriented and paid a lot of attention to the rasterization issues. His fonts are all really well hinted to begin with, and then there is Typekit's conditional .ps serving on top of that.

Thanks a lot, I think that's exactly what's happening here.

You may want to consider asking this on Stackoverlfow.com

I think it's in the TrueType hinting:

http://blog.typekit.com/2011/03/16/skolar-web-hinted-for-bet...