Okay, if you want feedback, I'll be happy to provide some.
Actually, I tried to find a site that could provide me with solid info about vintage cards (not sellers, but sites that can inform the reader about what's out there without following it up with a sales pitch) and found nothing. It immediately disappointed me and I stopped looking at your site.
However, if you'd like something like that to add...I have built a site that does exactly what I just described:
http://www.obaks.com/vintagebaseballcards/index.html
If you'd like to get something like that site added to your database, let me know.