A catalog of first run user experiences
The first impression is an important piece of the user onboarding journey, and this archive shows good and bad patterns in action across a variety of services, devices, and apps. You can even see how your favorite products today used to onboarding users in previous versions.
Of course, there's more to onboarding than just the first run. Check out my book Better Onboarding to see how to design entire end-to-end onboarding journeys.