It looks like the mapping is still active (I just deleted it; it will take up to 48 hours to unmap to your WordPress.com blog). In the meantime, you will also have to update your nameservers - they still point to NS1.WORDPRESS.COM, NS2.WORDPRESS.COM, and NS3.WORDPRESS.COM. Your new host will have nameservers that you should point to, instead. Just log into your domain the way you did to transfer it and update those.
Here's some more information on how to change your name servers:
I hope that helps you, but just let me know if you're getting stuck somewhere and we'll work through it!