Summary.... Cable, DBS and IPTV subscription TV networks have a huge advantage in offering video-on-demand content - they already have millions of TVs hooked up to their networks. But the download-to-own model produces more revenue per transaction, allowing Apple's iTunes Store to become the third-largest on-demand content seller in 2008. In contrast to the 79% growth in Internet on-demand spending, the subscription network VOD business grew a modest 16% to $1.1bn. Detailed model with projections to 2013 are available in AMR's "Subscription Network On-Demand Model" under "Data & Projection Models."