Please advise - when a man escorts a women down the isle during a wedding, which side should the man stand on - left or right side of the woman?

Ooh. Good question! The woman is almost always taken on the right side of the man.
From what I know, whenever a man took the hand of a woman on his arm to escort her, she would always be on his right hand side because men's weapons (sword or sable most usually) were worn in a way that it jut out to or took up the left side. The right hand side also has its own history of being preferred, to the left side, as a "good" side. (As the left side represents 'evil' and 'bad')
Hopefully others can give you more info as to why the right side.