Ask HN: Examples of good technical writing?

I wonder if HN could share their favorite pieces of technical writing?

Preferably openly available content so that everyone can access (blogs etc.)

Focus is on "overall" score: tone, presentation, etc. as opposed to "very technically advanced" (although advanced examples fully welcome)

EDIT: awesome suggestions so far - should add that it doesn't have to be programming or even computer related... cookbooks count!