Here's the first bug I've encountered on the iPod Touch.
Whenever you sync new podcasts onto the iPod Touch, it displays a small blue dot next to the name of each podcast to indicate that it has unplayed podcasts. Once you've listened to the podcast, this blue dot goes away to indicate that it's been listened to.
Sometimes, this blue dot reappears on podcasts I've already listened to. I'm not sure why this is happening. I suspect it may happen when I turn the iPod Touch fully off. Maybe it doesn't save the played state of all songs to the flash memory when you shut it down. If not it should.
Once I figure out exactly what's happening with this, I'll post an update...