Note that this does not import your friends' EMAIL ADDRESSES. Might be just be, but I find the pitch a little bit deceptive: to me, "Friends to Gmail" implies that you can subsequently email those friends.
That said, via the Facebook API a user can give your app permission to access their own email, but they (thankfully) cannot give your app permission to access the emails of their friends. I'd guess that's why he wasn't able to include emails in the CSV.
You'd have to create a pretty nasty hack to get around it and you'd probably be shutdown anyway.
I'm working on email addresses, but as others have noted, it's not in the API and would probably get this application banned...which wouldn't be the first time for me as many of you may know ;)
(Just re-writing it now actually, few improvements here and this time I'm doing it in Clojure.)