Although I could try this on my own, but i'm currently at work and really want to know this.
If I have a playlist, say of all the songs with 4 stars and I change the rating of a particular song to say 3, will that song be removed from the list? That is if I now scroll the list would I be able to see that song. Also, if that doesn't happen, would it happen when I restart my iPod? (i.e after restart, I won't see the song in the smart playlist)