Loooooved attending Respond. All the talks were really valuable to me, even the ones that went a little over my head technically. They spanned many different industries and angles too - talks from designers, developers and the advertising folk.
I particularly liked the more design-centric talks (naturally), such as ‘Simple responsive typography’ from Nabeela Ali and ‘Design Decisions Through the Lens of Performance’ from Yesenia Perez-Cruz. The talks from the advertising folk Kris Howard (‘Responsive Ads: This is Why We Can’t Have Nice Things’) and Andy Clarke (‘Counting stars: Creativity over predictability’) were also extremely controversial and interesting. I do believe the talks were recorded and should be available online at some stage? If anyone knows, please link!
There was also a lot of tweeting under #Respond15 - I admit, I contributed to that quiiiiiite a bit