My favorite technique for overcoming a so-called block (and I don't think there's really such a thing) is the following sentence: "And then the aliens landed."
Granted, that only works for fiction, and not if you're stuck in the middle of a thousand-word article on the latest trends in gourmet dining, but I might give it a shot there anyway.
My second-favorite technique is just to write something else, but at least "And then the aliens landed" keeps you in the mindspace of your current project.
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