This. Another experiment worth conducting is displaying their email address as a checkbox near the submit button:
(x) foobar@example.com is my email address where I can confirm my account
[Create account button]
(x) foobar@example.com is my email address where I can confirm my account
[Create account button]
I don't want to confuse users with more checkboxes/displays than necessary. Interesting experiment? Yes probably, but I would need more data than I have now to get meaningful results.