I've been working on a databse of ancient weapons and armor for about 5 years. I think you will find it is difficult to find a single accurate comprehensive source. There is a good basic overview of medieval and Renaissance swords here on the ARMA site and a good database of photographs of antique weapons at
http://www.myarmoury.com, though the photographs are not documented. Their forums are a good place to get information about period weapons and armor, though you may sift through a variety of data with different levels of value.
I could probably answer any specific question you might have as well. I'd be glad to help.
J