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Another neat undocumented feature in iPhone 3.0
If you have smart playlists synced from iTunes, they stay smart on the iPod app— if they’re based on play count or a podcast’s heard/unheard status and an item becomes unqualified for that playlist, it will be removed from the playlist. This is great news if you have a chronological playlist of all of your unheard podcasts that you like to listen to straight through. Please spread the word!