Playlists are almost my favorite feature- but I've been thinking it would be nice to provide an option to make them portable. You could embed it elsewhere, give it to your friends and each time you update it would be pushed out to whoever has your playlist as well.

I was also thinking that "public playlists" would be fun. This would allow Sifters to build playlists as a group.

What do you think? Any other features that would be good for something like this? Anyone want to help create the player? We pay in t-shirts.