Error when downloading videos in iTunes

Ok,
finally after 7 days, Apple has credited me with 5 free songs that shows up in my account.

But I have got to tell ya....I am really leery about downloading more episodes, I don't know which will give me the problems and which won't.
It's kind of like waiting for a timebomb to go off.
I am making a list of the epsiodes that people have been talking about on this and the other string, maybe that will me while I am walking through the
iTunes Mine Field.

I'm not getting an error message, it just keeps downloading the same episode of Battlestar Galactica, but as soon as it's done, the episode vanishes. Not on my hard drive, in my trash, in my iTunes music library, disk cache, or anywhere else. So far it's downloaded it 4 times, all to no success, but the other 14 episodes were fine, as were all 8 episodes of Weeds that I downloaded at the same time.

Now it's doing what other people have mentioned-- says there's an error with the server for the music store, so it won't let me check for purchased music and try to download it again. I sent Apple an email, but now I'm not all that confident that I'll get any help about it. Anyone else have any thoughts?