Jeremy, you may be looking for something like this - http://www.screenr.com/HTQH . I'd love to hear your thoughts on this topic. The Macaw guys are doing great, though!
With the caveat that I just watched the video and didn't do any further digging...
It looks really cool, but it may be for people who need a lot more freedom with their animations. Honestly, my needs could be met with just a handful of interactions (slide up, slide down, modal, tooltip, show, hide) with a handful of events (mouse in, mouse out, click, etc)