I'm with Ironchef .... read the product information. If they are forged they will state it ... otherwise manufacturers seem to either "over look" or fail to state the fact that they are stamped in most cases. Unless it is specifically stated that they are forged ... they are stamped.
For browsing and comparing ... go to www.Cooking.Com
and read the specs on the knives ... down in the "Product Characteristics" section ... look for a line that says "Construction:" - generally, stamped knives don't have that line - and if it is there will say they are forged.