I noticed a burning smell comming from my 07 edge.  Smelled like Vasoline.  My wife took it in and it turns out that there is a bad seal around the transmission and fluid was leaking onto the engine.  They said that this may be a production problem and there may be a recall coming.  My wife worked at the dealership, so I think they were pretty honest with us. 
  
Other than that, love my edge.