These posts have been the most popular for the first half of 2013:
Hacking debt
About a deficit of time spent hacking, not tricks for getting out of financial debt.
Extreme syntax
Lisp and Perl take opposite approaches to syntax and both have their advantages.
The weight of code
Some source code used to have physical weight. Code still has metaphorical weight.
Which Unicode characters can you depend on?
Which characters have widespread font support? Not many.
Why j for imaginary unit?
An advantage to using j for √-1 even if you’re not an electrical engineer.