After reading the question on web font typeface selection, it occurred to me that portable network fonts were the answer. We used to use a package by Bitstream to generate subsets of needed fonts to embed in web pages so that it looked the same in every browser on every platform. When I Googled this, I found an RFC that looks like it's owned by Bitstream, and not much else.
What happened to this technology? Am I just not seeing it? Or did it disappear because it was proprietary? If so, what's on the horizon for this technology?