朱建刚 with an implementation of the beautiful Path radial menu control.
More path UI deconstruction from Tim Duckett, this time is the turn of the floating date hint. There is another interesting article by Florian Mielke linked from the end Tim's post which is also worth reading. Let's all try and remember that what worked in the Path UI may or may not work in your app though and try to stop this and the radial menu becoming the next pull to refresh.
Jonathan Penn on MKNetworkKit using NSOperation over GCD. Personally I am a big fan of NSOperation and usually find myself reaching for it in preference to GCD as I find it easier to write clean code with concurrent code being well separated into classes. I have often wondered why NSOperation was only converted to be built atop GCD on Mac OS X though? Anyone know why?
Mugunth Kumar's aforementioned networking library.
Interesting "fix" with iOS 5 to allow case sensitive HTTP headers to be sent without modification. I put the word fix in quotes as HTTP header field named should be case insensitive but this is a nice modification if you are working with an incorrectly implemented API which you do not have control over.