How about a website registration that looks like this:

"Send an email to register@example.com with the following code: ABC123"

Your registration process gets the email, you can deduce the person's name and email address without typos, and you can then reply with an activation link allowing a password to be set (that page could also allow verifying/editing their "real name").

This lets users register without typing anything except their password on the activation page.

A drawback of this is that it breaks the "flow" of your site by having the user switch over to their email app. But most sites send an "activation" email anyway, so I'm not sure it's a net negative.

Edit: you probably don't even need to ask them to copy/paste the code. The code could be embedded in the address (e.g. register+ABC123@example.com) or in the subject attribute of the mailto link) or you might not even need a "code" at all.