Now that Webshots is gone, there are fewer images of sewing machine to be found. I guess many folks were using Webshots that collected vintage machines. Sadly, many of those images are now gone too.
I learned how to identify machines by some of those photos. I would compare them to some of the machines ThayerRags has posted on his site since he has named all of his machine. I would google X machine and images of machines X, Y and Z would show. It was my way of learning. I would then figure out what machine Y and Z would be through google searches. It was a learning game for me. And that is how I discovered many other wonderful sites.
I found Quilting Board by a google search of quilting with vintage machines. Oh well...hopeful folks will make a simple blog of their machines so that others can use them as a reference tool.