This blog post discusses something called “The Personality Layer”. What essentially is referring to is those neat little quirks that brighten your day or make you smile when you visit a page or use an app. Its designed to help users enjoy using the product more so they come back more often! The blog introduces the concept of emotional design and explains what it is, what its components are, and more importantly, how you can utilize it! There are some great examples of using it too! (I love the sad derrick for groupon example)
The blog is called The Personality Layer and is written by Simon Schmid.
(If you haven’t subscribed to Smashing magazine’s blog, I highly recommend it!)
*edit* Just noticed Dr. V’s post about what to subscribe to. I second it for Smashing Magazine!