polyphonic ring Walt Disney-owned Hollywood Records recently hooked up with Xingtone, a digital content provider that delivers ring tones and pictures directly to cell phones. As part of a marketing push Xingtone will handle the online distribution of free ring tones and images from the likes of Hilary Duff and Josh Kelley. Xingtone is primarily known for its software program that enables cell phone users to create custom ring tones from MP3s and WAV files on their PCs. The software works with phones from AT&T Wireless, Sprint, T-Mobile, and Cingular. Of course, this cuts the carriers out of the revenue stream. And as more users become more sophisticated about it, they'll simply rip their own songs and then transfer them without paying anyone any extra money. So the question is, what's the next wireless fad and rainmaker?.