Back in the late 80s when I first started reading fantasy I never conceived of a time when it would be possible to interact with a fantasy writer through the computer in the form of email, blog comments or any other means. The fact that I can now go to the website of an author like Brandon Sanderson and read excepts from his novels that didn't make the final book, side stories he wrote in his worlds using the characters, about the book he's currently working on or posts about the writing life is still astonishing. So much so that I'm often overwhelmed by what's all out there.
Did you know that you can buy jewelry based on the Aon - the magic system he invented for his novel Elantris?
Or that there are fantasy miniatures for his Mistborn characters? You can buy them in finished pewter, hand painted or ready to be painted by you.
You can watch book trailers for novels (upcoming or otherwise). Like this one for Mistborn.
Interested in art? You can watch the artist for Sanderson's newest novel, Warbreaker, do an oil painting of the cover - sped up, of course.