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A new circle constant is being promoted mainly here. the proposal is to have a new constant $\tau = 2\pi=6.28...$ to replace the familiar $\pi$.

One of the claimed benefits is that it will make reasoning about angles easier for students. Additionally a ratio of the radius to the circumference seems more 'natural' than a ratio of the diameter to circumference.

A numer of viral video like this offer a compelling case for the change, at least to a layman.

Is there any momentum for this change with in the professional community? Will we ever see tau in our textbooks. Who here celebrates Tauday (28th June)?

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I’m voting to close: this really has nothing much to do with mathematics. The short answer, however, is no. –  Brian M. Scott Oct 13 '12 at 19:42
    
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While the $2$ is annoying in a lot of formulas, lets face it, it is still only a $2$ that you multiply with your formula so that's not a big deal. So the advantage is slim. The disadvantage however is huge because the publishers bring out new editions for pretty much every math related publication with the updated $\pi$. Only the publishers are happy about that... –  Peter Sheldrick Oct 13 '12 at 19:47
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"One of the claimed benefits is that it will make reasoning about circles easier for students." This doesn't make any sense. –  student Oct 13 '12 at 19:52
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On the other hand the physicists managed to make a course correction in time and write all their formulas with $\hbar$ instead of $h$. But they noticed their original mistake before $h$ had gotten nearly as large a traction in textbooks and papers as $\pi$ has. –  Henning Makholm Oct 13 '12 at 19:59
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closed as not constructive by Austin Mohr, Brian M. Scott, Asaf Karagila, Cameron Buie, Henning Makholm Oct 13 '12 at 19:45

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