The transition's complete - all your D2D games should be over on GameFly now.
Basically, you take your D2D e-mail; ask to reset password; click on reset link from e-mail; and then create a new password.
Then, you can sign into GameFly and go from there.
There's a client and everything, which you'll need, if you're going to buy-to-download PC games from them.
ALSO - there's an extra 30% off coupon in your e-mail from GameFly, if you were once a D2D member.
That's good until 2/3/2012 (this upcoming Friday).