AOL will unveil a revamped video portal this week, the latest move by a major Internet company to strengthen its position in this very competitive market.The centerpiece of the upgraded portal will be a lineup of more than 45 video-on-demand channels with a mix of free and fee-based clips, the Dulles, Va., ISP plans to announce on Monday.People will be able to scan the channels\u2019 "thousands of hours of videos" using a new interactive programming guide, an AOL spokeswoman said.The channels will feature videos from a variety of AOL partners, including A&E Television Networks, MTV Networks, Turner Broadcasting System\u2019s TNT and TBS, and Warner Bros. Entertainment.The portal will go live at the latest by Friday in beta form online, and it will be launched in final form in August,\u00a0the spokeswoman\u00a0said. It will also feature a prominent link to AOL\u2019s video-sharing site UnCut, she said.AOL and other Internet companies such as Google and Yahoo have been busy lately beefing up their online video portals, search engines and stores as demand for this type of content has increased dramatically in the past year.Yahoo and Google recently outfitted their respective video sites with the features popularized by startup YouTube, which has become one of the Web\u2019s most popular destinations. Millions of people visit YouTube.com to view, upload and share mostly amateur videos.Google also recently began to stream for free some premium videos on Google Video that are normally fee-based, accompanying them with ads. The move is meant to increase traffic to the site.For AOL, which is changing from a subscription-based business model to an advertising-based model, having a well-trafficked video site is essential. AOL must attract a critical mass of people to AOL Video for its advertising-based strategy to succeed.-Juan Carlos Perez, IDG News Service (Miami Bureau)Check out our CIO News Alerts and Tech Informer pages for more updated news coverage.