It has been a couple years since I shot Kodachrome, but I plan to buy a
few rolls. I just finished sorting through 1400 of my grandfathers slides
shot in the 40's, 50's, and 60's. The Kodachrome slides (most of them) are
beautiful. All other brands are badly faded. (FWIW, here is one example:
http://homepage.mac.com/randrews4/.Pictures/Fred_Eleanor_Ray_62_63/630500234
33MonumentValleyW.jpg)

Anyone who is vane enough to think their grandchildren will want to look at
their pictures (I'm guilty) should consider Kodachrome.
    I know Kodak's Fairlawn lab still runs Kodachrome. I believe A&I in LA
does as well.
    Amateur Kodachrome is made a little green and is expected to "ripen" as
it ages. Professional Kodachrome is made at the ideal color balance and then
kept refrigerated. If you are doing studio work with gray sweep backgrounds,
the professional stuff is worthwhile. For scenic shots, the amateur stuff
will suffice.

Yes.

Since no photo stores where I live handle Kodachrome, I use prepaid
Kodak mailers that I buy from either Adorama or B&H.  The film goes to
the Kodak Fair Lawn, NJ, facility.  It takes about 10 to 14 days to get
it back through normal mail. You can shorten that time by using Express
Mail or one of the package delivery companies.

You can also buy prepaid mailers for A&I Photo in Los Angeles, if you
are closer to their plant. B&H sells those mailers as well.

Those are the only two retail places that process 35mm Kodachrome in the
US.