A New Postal Privacy Product
The idea is basically to use indirection to hide physical addresses. You would get a random number to give to your correspondents, and the post office would use that number to determine your real address. No security against government surveillance, but potentially valuable nonetheless.
EDITED TO ADD (10/11): Sai has contacted me and asked that people refrain from linking to or writing about this for now, until he posts some more/better information. I’ll update this post with a new link when he sends it to me.
EDITED TO ADD (10/17): Sai has again contacted me, saying that he has posted the more/better information, and that the one true link for the proposal is here.