Some links to design guidelines every developer/graphic artist should know:
https://developer.apple.com/library/ios/documentation/userexperience/conceptual/MobileHIG/index.html
User experience
There are 3 posts filed in User experience (this is page 1 of 1).
Google’s new “Material Design”
If you can ignore that ugly sample on the first page, it is pretty amazing:
http://www.google.com/design/spec/material-design/introduction.html
For everyone with a Nexus 5 or Nexus 7 a developer preview of the new android version using their new Material Design is available:
http://developer.android.com/preview/index.html
Interesting UX testing procedure
Interesting UX testing procedure: Grab your mobile, install a screencapture tool, grab a stranger on the street and let them try out use cases on your app. Heard today at the UX meetup in Vienna from this guy: http://www.nofro.com