MacLeod's blog entry came up on another forum. He implies that you'd have to justify your purchases to your neighbors. http://kenmacleod.blogspot.com/2004/06/looking-upward-max-mitchell-asks.html
For what it's worth, someone pointed out that Parecon offers things like anonymity to help keep busybodies at bay. http://www.zmag.org/books/pareconv/Chapter18.htm#_VPID_121
I guess purchasing illegal materials would probably best be done in a black market...
All best, Tayssir