It's times like these I'm grateful for video-conversion software: iTunes doesn't play Podcasts reliably on my old PC, but it sounds as if downloading those Season 1 Episodes (and converting them to a friendlier format, in my case) is worth a few dollars. Way to go, Sesame Workshop--I plan to at least download once a month, to help you keep it up!
Edited to add: Uh oh, my store connection keeps timing out in iTunes; even downloading the Flashback video didn't work out.
Guess I'll have to ask someone with a faster connection to help!