Here is the NTSB animation for what happened...very chilling viewing.
YouTube - NTSB Colgan Air Crash Animation Flight 3407
For those who haven't read the reports, icing was not a factor in this crash. The crew were also heard to be talking about non-operational matters throughout the approach (ie below sterile) and as the above news article points out, fatigue.
Very messy trail and hopefully things are put in place over there.