However good TiVo's new Roamio DVRs may be, not everyone can justify purchasing them -- especially not TV providers that would have to buy in bulk. TiVo could make that experience more accessible with its just-unveiled Network PVR. The service (not yet pictured) puts the Roamio interface in the cloud, letting operators offer similar recording and streaming features though cheaper set-top boxes and mobile devices. Network PVR shoul
