Yes! Even though that site is gone, the legend has passed into internet lore. It's easy enough to find sites where brave individuals have sacrificed their kidneys to replicate the experiment, with varying results. The jury seems to be out on how effective filtration is, but it seems to make bad vodkas at least palatable to the Skyy level, if not to the point of being really good stuff.

It's probably not a substitute for a good vodka, but if one already has a Brita filter, it's worth a try. Now, if someone can test to see if it will get rid of the icky flavoring in "flavored" vodkas...