tl;dr watch the video
Me announcing the open-source Garner gem, https://github.com/artsy/garner and talking about server-side caching. A few people came up to me after the quick talk and said it really helped them put 2 and 2 together between If-Modified-Since, If-None-Match, E-Tags and 304s. Cool.
Amongst other talks at GoRuCo I encourage you to watch David Chelimsky’s presentation on DRY and then, of course, the rest of the awesome talks at the best Ruby conference in the world.