Love the idea. Could definitely see myself using this. As a designer I do not always want to figure out how to do this myself and having a place where I can go a copy already compliant and web ready css animations will make my life as a front end dev/designer much easier and faster.
Helpful by providing an 'outline' making itt a bit more dificult to forget something when designing your own effects. Sort of like a checklist. I am looking forward to actually using this tool.
Elegant site layout, demo of each animation is displayed, and CSS can easily be copied