Originally Posted by Buddha Jones 
I agree... the Tamron 28-75mm is a great lens!
Agreed... Tamron 28-75 is the one to have if you only have one. Rarely at a wedding do you need to go as wide as 16mm but the extra length out to 75 (instead of 50mm) is quite handy. Plus its a beautiful lens.
Still... I can't imagine doing a whole wedding with only one lens or one body but each location dictates your requirements. I shot a whole wedding at 300mm once with very nice results (film).