Currently there isn't a feature to show which has been watched or not. One thing I would point out is that if an episode has been watched but stopped before the end was reached then it will ask you to 'Resume'. That's only if the programme was stopped before it ended of it's own accord.
I will put forward this suggestion as it would be quite handy for those who tend to have series marathons.
If you have any further queries, let me know.
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I already have the Partially Watched option in view, but currently there is no facility to flag shows one has already watched end-to-end as 'Watched'. The V+ box used to do this, and it was really handy for those of us who are working their way through a series, but not wanting to delete the shows we've seen.
I just want to thank TivoFan for creating such an informative post, which I'm sure will help a lot of people. It doesn't quite solve the issue the original poster raised. The thing is, if one allows a recording to run right to the end, rather than stopping it manually at the end of the show, it no longer counts as Partially Watched, and consequently disappears from that folder.