Hi there,
when you click on “Sign up” in the “My Account”-Dropdown in header the first thing you see is the section for “Registered Customers”. Since the “Not Registered?” part is below the fold, a customer has to scroll to find it.
This is – in my opinion – a little bit confusing. A nicer, more customer-oriented solution is a two column (left/right) version like you have in the Neighborhood or Dante Theme for example. http://dante.swiftideas.net/my-account/
Also the “Register”-Button on the site could be a little bit more visible. It is not really recognizable as a button.
Cheers!
Maike