Just a regular old username + password, kind of like HN allows?

I feel like email overtook usernames because it was more likely to be unique/memorable. I hate when websites ask me to remember a username (even though I'm using a password manager so I should really just calm down.)

	▲	bigstrat2003 an hour ago \| parent [-]
		Usernames are no less likely to be unique and memorable than an email. You presumably chose something memorable for your email, so just enter that without the @foo.com bit. There, memorable and probably unique.