Use up your Kodachrome and send it to Dwayne's Photo Lab!!!! SOOOOON! Get it to them as soon as possible, coz the very last day for processing is 30th December (which means they have to have all the films with them before then!). It's snowing like a bitch here in Shipley, looks amazing, great for filming! Gonna go charge up my Beaulieu R16 now and hop to it!
If you miss the Kodachrome deadline, DON'T DESPAIR! You can still process it as b/w!
For old stock, or stock that hasn't been unfailingly kept in the fridge:
Martin Baumgarten recommends processing it to negative, rather than as reversal, coz otherwise it will probably come out very muddy.
For stock that has been brilliantly preserved, or very recent stock:
Martin Baumgarten says that it will probably be fine to process it as reversal.
Maybe this snowy weather would be good for shooting high con stock when the sun is out to play!