A DownFox user requested this feature.

Now when a store lists for sale something which you have Wish-Listed, you'll receive an email notification.

By default, this email is turned out when you join.  You can opt out of course:
DownFox.com/wish/Notify.asp

No more having to re-check the website constantly to see if your Wish-List item is for sale.  And for sellers, same thing: no need to check multiple wish lists to see if what you have is wanted.

Note: The email notifications still maintain anonymity, as the seller sending the emails can see only the count of emails going out, but not to whom.