I'm in Australia, so shipping from the US is prohibitively high. I don't even want to talk about buying glazes...... I LOVE the DVD downloads. I have four now, and will purchase more in the future. I wait until the ones I want are on special and snap 'em up for $20 or $30. I play them on both my computer, and on my mini iPad in my studio. I love being able to pause, rewind, pause, rewind... I am quite happy to pay the money as the DVD's are exceptionally good value and a similar length of workshop would cost hundreds. My only real issue is my difficulty in making the clay do what the presenter is making it do I have to keep reminding myself that this is someone with thirty years experience !!
I do also have a collection of books. I use these more for inspiration than technique. I recently purchased Frida Anthin's "Handmade Pottery At Home" http://www.amazon.co...95208647&sr=1-1 as I LOVE her work and she has very generously provided templates for a number of projects in her book...
But for me, the technique is in seeing how someone handles the clay. Although I love Frida's book, there is no way of knowing what state the clay is in. As soon as Sanda Pieratozzi picks up one of her slabs, you can immediately see how soft and floppy it is. How she doesn't leave fingermarks is a mystery to me, but you get the idea.
Oh, and I'm a bibliophile, for what its worth. I love books - I used to be a Librarian But for me, the value is in the practical application of the information; and for ceramics I do think the DVDs work better. Obviously something like glaze recipes would work better in a book though !