Cuban a la Sifry, with a "hey look what we do that they don't, welcome to the marketplace" sort of a thing.... I'm not sure what I think of this as a marketing strategy / response to Google's launch. I guess time will tell how the market shapes up & whether a single engine emerges as the preferred tool of blog readers. I have a sneaking suspicion, though, that existing services will need to innovate / distinguish themselves with unique tools in order to maintain interest. Tags / focussed topic searches are unique right now, but the rel="tag" attribute isn't a secret...

Update: Mark Cuban's post has vanished.

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