bart_scriv writes "BusinessWeek looks at YouTube's rapidly growing imitators and questions the site's long-term viability. In addition to the competition, YouTube continues to face problems caused by its reliance on copyrighted material; the site's popularity is service- (rather than emotion-) based, which makes it a ripe target for anyone that might replicate and improve the service. From the article: 'YouTube's own challengers are advancing at a rapid rate. AOL is re-engineering its video site to mirror YouTube's success, and CNN is launching CNN Exchange, which will house user-contributed video features. Then there are sites like Eefoof.com, Panjea.com, Revver and Blip.TV, which share up to 50 percent of ad page revenue with the creator of the videos. Others like Dabble.com (currently in beta) sort through all video hosting sites (like YouTube and its competition) for search content, while specialty video sites like Pornotube concentrate on one point of interest.'"