HUD has recently been released in Cydia and shows you the thumbnail of your current album and which track is playing. Every time a track is skipped or a new track starts, a thumbnail will pop up on your screen. Check the video out for a quick demo of what this free tweak can do.
This tweak is available from the ModMyi repo for free. As you can see in the video below, it allows users to keep track of what album or song is playing without having to enter the app. Best part about this tweak apart from it being free is that it works with Spotify as well as the iPod default music player.
Video Demo below showing the tweak in action.