I made this a few days ago while brushing up on my UI/Photoshop skills. I wasn't going to post it anywhere until a friend mentioned it might be of interest to other Spotify users.
The idea came about, after I kept maximising and minimising Spotify just to see my play queue and sometimes jump down a few . This is my solution making it a less obtrusive way of seeing what's coming up and track jumping.
I'm sure there are lots of limitations as to why this can't be made into a real working taskbar item, but any feedback is still much appreciated.
The image is still awaiting approval so it might not be showing up for some. You can view it online here: http://forr.st/~UMb
Pressing spacebar in an app scrolls the page (or does nothing). I know this behaviour comes from the fact that apps is built using web technogly and run in Chromium that's embed into Spotify desktop, but almost everywhere else in Spotify spacebar is play/pause.
Also: Make cmd+L (OS X) focus the search input in apps/radio (as it is in the rest of the app) (I know that option+cmd+F works for this in apps/radio)
When I close the Spotify window on Mac (using ctrl-w), it is cumbersome to reopen. First of all, your option-command-1 shortcut for opening the main window is not the standard, so I have to remember a specific shortcut for Spotify. Second, a lot of apps automatically reopen the window if I command-tab back to the application. I really wish Spotify would do this.
Please bear in mind that the Community is not an official Spotify support service. It's a place where we all help each other, whether we work for Spotify or not. So please use your discretion when using the forum.