You probably get same login ..all your stocks should get transfer to TD.. Nothing should change..Not sure if they will keep Scottrade open still during the transfer or keep both open.. can call them now and ask they 24/7 services. :)
You log in with your scottrade username and password. My understanding is the old site will no longer work as of 415 yesterday. They are expecting to have the accounts moved by Monday am. And yes you should also go open an etrade account for the ones that td won't let you buy. That is what I did so I use both accounts.
News 
Market Data 
Discover 
