I'd love to see my video and music play queues roam between my devices. I find myself sticking together a playlist on my desktop (Windows 8.1 app) only to want to have it on my tablet (8.1 app) or my phone (WP 8.1 app), or even my TV (RasPlex / PHT). Of course some of these are workaround-able. For the main clients I can connect to them as a remote player, hit play, then disconnect. This is however a workaround and will not work on my phone. Ideally each user within a home should have their own play queues which follow them between devices (including partially played content ideally).
Early 2021 clean-up: duplicate