No, but if the only thing you do in your sidekick is text you can eliminate the sidekick plan because it is basically unlimited text with email and internet. So if you find that you are not using these features as much you could try that.
To import media on to your phone go desktop manager, click help and choose the icons you want to see on your desktop manager. You could always drag the media onto your phone if you are using an sd memory card, without going through the desktop manager.