Similar transparency problems in other countries
There are similar problems of transparency and accountability in other countries also, for instance Norway: Norway has a blocking system similar to the IWF. The fact that a page is blocked is not hidden under the Norwegian system. However, the criteria for maintaining the list of blocked domains are not public, and there is no way to "appeal" if you suspect something is on the list by mistake.
Using an example from the leaked Danish blocking list (http://wikileaks.org/wiki/Denmark:_3863_sites_on_censorship_list%2C_Feb_2008), vanbokhorst.nl is still on the Norwegian blocking list today, almost a year afterwards, even though it appears to be perfectly legitimate. It would seem to be a valid question whether it is actually possible to get off the list.