SEATTLE, WA – CanWest Global and the CBC have signed on with Comcast subsidiary thePlatform to manage their on-line video efforts.In a recent blog post, thePlatform said that it will provide CanWest with a scalable on-line video solution for its television and newspaper assets, including 18 specialty channels and the GlobalTV network, and CBC with an on-demand video and audio portal for broadcast TV, film clips, and webisodes from numerous Canadian and global content producers.Other Canadian clients include Rogers for its Rogers On Demand Online initiative, and Corus Entertainment for its Treehouse TV, YTV and W Network entertainment portals.White-label video management and publishing company...