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Tom Boblittlooks like that is a subscription only service article.........
I've long thought that ebay would serve as a perfect place for price guides. It could be an online service they could offer by category and actually follow it up with print guides on a yearly basis.
It would be difficult (as the other guides) to split out single cards from lots that are sold and the question of shill bidding affecting price would certainly affect the accuracy of any guide.
For PSA, BGS and SGC type cards--it would serve as a TRUE model of what something sells for. I've always had a problem with SMR pricing cards that are graded by PSA and I don't think Beckett has done an adequate job pricing graded cards--especially pre-Topps/Bowman stuff.