Thanks for your feedback.

The current status is as follows...

• N9 Harmattan
  Has been updated with the suggested features. I also found some issues during testing, which now should be fixed.
  I have submitted Squeezster to the Nokia (Ovi) store. Let's see if it passes all checks and actually reaches the store. Unlike the N900 version, the N9 version will not be completely free, but will be available for a small fee (~2 euros).
• Symbian
  Squeezster for Symbian Anna is a port of the N9 version. It features the same functionality as Squeezster for N9. It has also been submitted to Nokia Store with the same pricing as the N9 version.
• N900 Maemo
  I will make an update for the N900, using json instead of CLI, as mentioned earlier.
  The N900 version will stay in the Extras repository as before, and still be free.