Thanks for putting this together!
One thing that would be really useful would be information about traits of various sets and traits of common reprints or fakes. For example, 33 Goudey cards should be completely opaque when held up to a bright light - nothing gets through them. And, for another example, cracker jack reprints often have a sharper difference between player jersey color and the card border than originals do, and will sometimes have the words "Cracker Jack" very close to or even cut off by the border. This wouldn't replace getting to know a set yourself, but it would be some guidance. If someone who was an expert on set X posted what they know about it, and an expert on set Y posted about that one, this wouldn't be too hard to set up.
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