Wil Shipley (Delicious Library): On Heuristics and Human Factors. This is a big part of what separates great applications from the rest.
Hivelogic: Installing MySQL on Mac OS X (from source). Useful if you can't use a prebuilt package for some reason. (Remember to adjust the instructions for the latest version instead of 5.1.33.)
John C. Welch (aka Bynkii, Angry Mac Bastard): Password Changes in Open Directory (One burst of profanity). For us Mac users who are sometimes a little too smug about the Mac's user interface. (The podcast: Angry Mac Bastards. Extreme profanity there, though.)
Loren Brichter (Atebits, Tweetie): Not Your Average iPhone Screencast. How to make the simulator look like a real device in screencasts.
Faruk Ateş: The Conquest That Wasn't. How Microsoft dominated the PC world without conquering it. I think Faruk utterly nails this.
Tenni Theurer (Yahoo Interface Blog): Web Performance Research, Part 3: When the Cookie Crumbles. From 2007, but I hadn't seen it yet.
Matt Gallagher (Cocoa with Love): Safe, threaded design and inter-thread communication
Chris Hanson on Objective-C 2.0's dot syntax. When to use it, when to not use it, and what it's really there for.
Elizabeth Gilbert (Eat, Pray, Love): on nurturing creativity. Probably my favorite TED talk. I saw this a few months ago, but promptly forgot about it, so I'm linking to it this time.
Zack Rusin: Git cheat sheet. (via unixfudotnet)