The slides from iOSDevUK are up, which reminds me I really should get to one of these - it's their second year, and reports out of there were all positive.
Of the few that are up there, these caught my attention:
- Shawn Welch's talk on gestures (pdfs)
- Ivo Jansch' talk on Securely storing secrets (speakerdeck), especially as I want to use KeyChain in the next mobileAgent release.
- Malcolm Barclay's talk on threading looks really good to - covers C (pthreds), NSThread and also GDC.
- Oliver Mason's talk on NSLinguisticTagger is brilliant for the presentation alone (the topic is very cool, too)
I must say I prefer the MonoTouch/C# way of doing things like threading tho, using lambdas and delegates - more keeping the code together, rather than splitting it up. The blocks in GCD do make it a lot cleaner tho. It's all pthreads under the hood tho.
If you happen to have access to the WWDC 2012 content (all registered developers have it), then session 211 is an essential read. (not linking or putting the title in due to NDA)