GookBox allows users to play your music anywhere you have an internet connection by utilizing your Gmail account to store your files in. Regardless if this app may be in violation of Googles Terms of Services it's still a interesting idea. Made from Java, so should be cross-platform able, the trial looks pretty basic but currently inoperable cause they're running the app out of the same Gmail account. But, if they clean up the name and avoid getting google's legal department to shut them down, the idea's good.