Well, in response to the many questions to my first post...
A) Obviously, 64-bit allows addressing of more than 4 gigs of RAM.
B) 64-bit programs run somewhat faster
C) 64-bit OSes are marginally more secure than their 32-bit counterparts
I shall clarify my initial post as well: Why should a newly created OS tentatively thought to be released in 2012 support legacy tech that is more than a few years old? Linux shouldn't support this old tech either. Frankly, it would be beneficial to get all of the ancient software (some of it dating back to the 80s!) that businesses are running, and aging hardware out of the wild. Outside of the nightmare this ancient stuff creates for IT departments everywhere, it would also give the tech industry a nice little economic boost if a good many customers had to buy new equipment. Frankly I'm of the opinion that a new, 2012 OS such as Windows 8 should be released solely as a 64 bit OS, and those who continue to use 32-bit only hardware/software (out of necessity or pure stubborness) can use Windows 7 32-bit until MS decides to cut support. Which, if it goes the same way as XP, will be a good long time after Windows 8 releases, so there will be no worries. And the REALLY stubborn can be like the occasional person I run across these days still running 98... still on XP!