registration form has a separate "remember me" checkbox (also noted in comments to #10)
registration live-checks if email already has an account as well as if a username is taken
agreement with the ToS is implicit via a message you get after registering
prefs page also allows changing / setting email address and requires password to do so
the prefs page links to the confirmation-email-resend page when verification is pending as well
expired password reset links direct you to the reset password form with a querystring-raised message noting the link expired
password change is executed via ajax
"log me out everywhere" only logs out other sessions, and is a box on password change only, unchecked
password change spawns a notification email
Reddit is 100% about not being able to change usernames, they only did it once and that was for President Obama
not really a profileable thing but password reset tells you NOT to care if someone sent a spurious reset notification because anybody can do it, which kind of overlooks "it's possible that someone has access to your email and is using it to break into your reddit account", which, you know, happens?
Stray observations and notes:
not really a profileable thing but password reset tells you NOT to care if someone sent a spurious reset notification because anybody can do it, which kind of overlooks "it's possible that someone has access to your email and is using it to break into your reddit account", which, you know, happens?