Anyone know what the default sans-serif font is called? Thanks
Source Sans Pro, a free open-source font from Adobe: http://blogs.adobe.com/typblography/2012/08/source-sans-pro.html
You can read about our contributions to the project here: http://blogs.adobe.com/typblography/2012/11/source-sans-pro-adoption-and-development-to-date.html
Thank you Bradley. I happen to be using Source Code Pro as my emacs default font and it looks really nice. The sans-serif sibling looks beautiful as well.