Nick Lockwood with an iOS 7 live blur component which performs remarkably well (despite not yet using the iOS 7 snapshotting code as of the current release). It can also be configured to do non-live blurring on a view which is probably a more sensible option for performance. To top it all off it's compatible with iOS 6 and looks to be completely App Store safe to me. This looks like a great solution.
Neat tip from Zach Waugh for preventing Xcode compiling in situations where configuration flags would cause bad things to happen. I don't see #error and #warning used very often but they can be very useful in the right situation.
Håvard Fossli with some useful macros for SenTestingKit to wait while asynchronous code is tested. It includes support for timing out after a duration to also fail the test if it takes too long. Looks to be a very simple solution to this issue.
Very pretty, simple, animated pie chart component from XY Feng.