I thought for sure that Pinterest would have killed Tumblr. I find my tumblr stream too unfocused. With the specific boards in pinterest, it would seem that a user would be able to define exactly what they want to see. But it doesn’t quiet work that way as my pinterest news streams seems to be even more unfocused than tumblr. It’s a big spaghetti board of random pins.
I might give tumblr another try, as it might have more of a feeling of being focused where you just have one column of content.