The Week in Rap is exactly that. Each week, a new rap recapping the important news is written, recorded and enhanced with relevant video imagery allowing you to learn about the entire week...through rap. The writing is very clever and the videos are well edited making them both informational and enjoyable to watch. I could see this as a great tool to use in a current events type class or just to help kids stay abreast of the major events taking place on a weekly basis. Check out the sample below, which recounts the week of news when President Obama was sworn into office.
The Week in Rap - Obama's Inauguration from Week in Rap on Vimeo.
You can subscribe to the site so that the new videos are automatically sent to your computer. Of course, since these are videos you will probably find they are blocked in your school but many of them include a link that allows you to download the video directly to your computer, thereby avoiding the problem of blocked content.