I plan to post all of the slides, sessions and reactions to Magento Imagine that I come across in this article - I'll update this article as I find more. If you presented at Magento Imagine, please tweet a link to your slides with the #MagentoImagine hashtag and I'll add it here, or post a comment below with the link and I'll get the post updated ASAP. Thanks, and thank you everyone for such an amazing time at Magento Imagine this year - already looking forward to 2015! Simple Steps to Win the Site Performance Battle - Nexcess Breakout Session
If you don't see the presentation you're interested in listed here, check the Imagine website to see if it's been posted there.
Also, there's a few reaction articles being posted, which I'll list below. Let me know if I missed your article!
Alan Storm's Imagine 2014: Magento 1.9 Infinite Theme Fallback