I'm starting to like this idea... but here are a few questions that might need to be addressed...
Is the BTC buyer's info known to the spender when they buy something from the wishlist and have it shipped to the spender? On the invoice with the package?
What about product returns, defective merchandise or simple dissatisfaction? I could see the return/dispute thing being a real pain for the BTC buyer.
How would you deal with 'unresponsive BTC spenders'? The BTC should be released to the buyer after a certain amount of time by default, don't you think?
So with reviews you can deal with trusted spenders/buyers... would the market be able to adjust for risk, like better prices for trusted members?
Overall I look forward to seeing where this goes!