I was one of the lucky users. I was on the road (coming back from a family funeral in rural Kansas) at the time the email was sent, so I was barely on my cell phone network enough to see the email, and wasn't near my desktop computer where I usually do all my password changes. But I only use my password for any given site on that site itself, and I have now reset my Hacker News password, so all's well that ends well. Thanks to the HN team for fixing the bug and for notifying the users affected by the bug.