Acumen 1.3.7 for Magento Community Edition 22.214.171.124 is available now. This was mainly a compatibility release, but also includes PayPal “Bill Me Later” functionality. Full release info is on the changelog.
Inline JS within one-page checkout isn’t executed in the global scope and that can break things.
Attached are my slides and speaking notes from my presentation on mobile first, responsive design for eCommerce at Magento Imagine 2012.
Updated for Magento 126.96.36.199 compatibility and a little slimmer.