As other have said here, Stripe was one of those things that just made sense. As a web developer I was tired of jumping through the many hoops of authorize.net or praying that people would complete the purchase path on PayPal. When Stripe came out I (apparently) jumped immediately on it and haven't looked back. It is the only payment solutions provider I offer my clients or use on my own projects.
But the larger impact it has had on me is that it gave me that much more faith in HN as a source of emerging technology solutions. I still comb through batch announcements or check out Show HNs to see what's coming, because I feel like there's a good chance another Stripe is launching today. And it's just as cool that Patrick Collison still is involved in HN. Thanks pc and the rest of you all at Stripe!