An exchange without a log in. Just a web front that generates an address to send DRK to anonymously that you input a BTC address to exchange to.The only thing it gives you is a transaction id. Or vice versa.
It's cool and doable, the question: if it's needed.
I see it this way: at coinedup.com you can login with a gmail.com-account.
So if you have like 1 one exchange per week, you would manuelly sign up a new gmail-account every week.
If you need more you download gmail-account-generator or buy 1000 generated gmail-accounts at black hat seo shops/sites for $20 or what it costs.