It has been 3 years that Tate Modern is doing this... firstly as an audience building strategy to attract young audience. They even worked with Playstation to launch some interactive work.
Now, more than soely for audience building, they are normalising art, making it widely available in the internet and for free. Youtube is another partner of Tate to meet the same end.
More than 400 files are now on iTunes U - a section of the online store which features educational content. Projects include a series of films that use social networking site Twitter to bring the audience's questions directly to artists like David Hockney. There are also recent interviews with contemporary artists including Jeff Koons and Louise Bourgeois. Clips of Turner Prize-winning artist Martin Creed and his band performing at the Tate Modern are featured alongside debates about his work. (Personally, I love watching the artists interviews, to listen to them first-hand and to recognise their face. In case one day you bump into Jeff Koons, you have to realise who the hell is blocking your way.)
Another part is the educational. As we are now infected with reading-disability, we need visual aids. So here you are audio recordings of leading academics, teaching resources and multimedia guides for the latest Tate exhibitions, which will also be made available in iTunes.
The question is, when vast data is available in the net, you feel the dismay of swimming in a enormous sea and seeing no end... remember what Nineteen Hundreds (Legend of 1900) says of NY City? "You rolled out in front of me a keyboard of millions of keys, millions and billions of keys that never end. That they never end. That keyboard is infinite... and if that keyboard is infinite, then on that keyboard there is no music you can play. You're sitting on the wrong bench... That is God's piano." Should we zap between Tate iTunes, MoMA Youtubes, Artbabble, Artnet, etc. etc.?