Usability

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http://uxmag.com/articles/these-are-your-users-read-and-be-horrified

These are your users... read and be horrified

This came to my attention via my friend and colleague Sean Christmann ( @seanalltogether ) from EffectiveUI , who writes:
You may have heard this story about an elephant: A king brings six men into a dark building. http://uxmag.com/articles/the-psychologists-view-of-ux-design

The Psychologist’s View of UX Design

http://www.crazyegg.com/overview

Crazy Egg - build heatmaps and track clicks

There is nothing in Google Analytics that can replace the functionality Crazy Egg provides -- Google Analytics have the site overlay report, this tells you what percentage of people clicked through to what page -- but it can't tell you which part they clicked. Crazy Egg shows you where everyone has clicked, whether it was on a link or not -- this highlights usability errors and often areas that could result in an improvement in conversions.