As was stated forensic approaches could crack this.  Analyzing the packaging, for instance, and then watching the mailboxes it was sent from for someone using similar packaging (after placing an order)  Analyzing incidences of people shipping two packages of the same weight at the same time to different addresses. 

And, of course, there is the issue of establishing trust.

The obvious problem is how to deal with scammers.  IE those who sell an item but do not actually deliver it.

This can be remedied in various ways, E-bay uses a rating system, which is a good idea.  The problem is that with the complete anonymity of bitcoins scammer sellers would simply make a new account.  Making accounts in some way not anonymous, and in need of verification, could, perhaps, be a solution to this problem.

This is not working for me, as in I am not seeing any site when I click on the links.

I know that the existence of something like this would greatly increase the utility of bitcoins.  Also I think that a focus on extreme anonymity is counter productive as any trade in real goods is going to require a shipping address anyway.

I'd like to see it either accepted at E-bay or at some other sort of online trading site.