[Warning: i have not tested this solution yet. I will test it tonight.]
You need to set up a "Smart Playlist" with a couple specific options...
- Start iTunes.
- Open the file menu and select "Smart Playlist".
- Change the first rule to "podcast" and "is true".
- Create a second rule of "play count is" and "0".
- Then add whatever other rules you want to narrow down what pod casts are opn the playlist.
That should do it.