Stripe looks so awesome that it's got me thinking about charging for things that I might not have bothered charging for in the past. I think that's one of the unseen benefits. I'm looking forward to using Stripe.
A lot of people doesn't notice this, but when all you have to do to start charging people is include a couple lines of Javascript then the game totally changes. Imagine being able to charge (or just put a donation button) on all those weekend projects you see advertised in HN!
I think that as soon as they start expanding outside the US the market for web applications will radically change.
