[Apple iPod] Manually synching only certain podcasts

I subscribe to several podcasts and listen to them on my 5G iPod at work. When I've listened
to an episode of a podcast, I then want to have it removed from my iPod, and have only the
ones that I've listened to removed, to free up disc space. I'd thought that this was done by
un-checking the episode in the iTunes listing, then synching my iPod. But I must be wrong
because the file remains on the iPod. Anyone know how this is done? Thanks.

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