Quartz Composer + Facebook Origami is a probably the most effective way of quickly creating demo-able UI interactions. The problem with most solutions (AE, PS Timeline...) is you can't actually interact with them other than hitting play. So you have no idea if a nifty animation will turn out to be annoying as hell. But with QC, you can actually interact as you would IRL. You can see a short demo here: http://vimeo.com/85578380
Quartz Composer + Facebook Origami is a probably the most effective way of quickly creating demo-able UI interactions. The problem with most solutions (AE, PS Timeline...) is you can't actually interact with them other than hitting play. So you have no idea if a nifty animation will turn out to be annoying as hell. But with QC, you can actually interact as you would IRL. You can see a short demo here: http://vimeo.com/85578380