Continue playing the play queue when switching devices

I think a handy feature would be able to be playing something on the web player then pick up a mobile device and have the ability to load the play queue there. I realise I could probably save the play queue as a playlist, but i would end up with many playlists that i would have to clean out. The other possibility would be that i hand recreate the playlist on the mobile manually, but I'm lazy and would love to just be able to hit one button when i leave the house or get in the car and continue where i left off. Same in reverse would be good to.