User Onboarding
User Onboarding is the process of radically increasing the likelihood that new users become successful when adopting your product.
Thinking about a redesign? Do this first
Before changing your onboarding, capture it in detail
How Customer.io Redesigned Their Onboarding
Hear all the juicy details of how they overhauled their conversion experience!
Teardowns
Let's learn some lessons from how popular web apps do it!
Here's the latest:
And here are some other recent ones:
QuickBooks 
Bitcoin 
Dropbox