Helvetica Simplicity
http://amdavidson.me/p/theme

Readme

This theme is the work of Andrew Davidson <andrew@amdavidson.com> for
use on his personal SweetCron lifestream site at http://amdavidson.me

It is released to the public as GPL3 software and is free for commercial
and non-commercial use so long as the GPL3 terms are statisfied.

A copy of the GPL3 license should have been distributed with this 
software if not, please contact Andrew Davidson <andrew@amdavidson.com>
with the location where you downloaded the software, so he can deal 
with the infringement.