I downloaded a few videos when I first heard about it, about a year ago I think. There was some interesting stuff, but on the other hand there is so much intersting stuff all over the internet, I can't look at all of it
Maybe I should look again though, I suppose there must be more content now. How do you find stuff? Do you use the search function? I always find it difficult to find things in the iTunes store, unless I know exactly what I am looking for, and I usually don't, except for apps. For instance, browsing for music or videos never seems to bring up much I'm interested in. Never tried to look for books.