We were talking about this in work today,i'm not a big fan of t.v replays although as soon as the descisions start going against us i'm sure i'll change my mind,one thing that hasn't been mentioned though is the possibilty of using 2 refs,one in each half or 2 linesmen on each side of the pitch,each with responsibility up to the halfway line,i believe the f.a mentined this a while back but i dont know if they have ever had a trial