Nationality-based blacklisting from academic publishing. Via Gowers. Given that I apparently live in a rogue surveillance state that tortures people, conducts undeclared cyberwar against the French, etc., this sort of collective punishment for government misbehavior troubles me. I suppose it's better than bombing them, though.
And, to make up for all that seriousness:
PingFS: keeping your data in the cloud by juggling raindrops.
You know how I recently posted that attaching labels to the things they label by curves or slanted lines would be better than axis-parallel polylines? This isn't what I meant. And many more bad ideas in information visualization, via MF.
Hexadecimal metric system. Complete with a new method of writing hexadecimal numbers, using a system of syllables for digits in which the consonant of each syllable tells you the digit value (in the obvious ordering q, b, p, v, f, z, s, d, t, j, c, g, k, y, x, w, h) and the vowel tells you what power of 16 it should be multiplied by.