I've seen about every one. My favorites are usually from Richard Matheson.
My favorite episode is actually one from Sterling himself I believe; the one called A Stop at Willougby, where the dude hates his life so much in the city and his boss he jumps off a train. But in his mind, he's going to a peaceful small town.
The other one that rules is the episode where the store maniquins come to life and have a week to live like a real human before having to return to the store to stand there.
I missed the marathon this year, which sucks, cause I can watch them all day long (and did that a 4th of July a few years back - it was heaven).