I am looking for a plug in that wil help me speed up the production time on my motion graphics projects. I want to be able to apply an effect to an object or text and make it swing in, bounce, wiggle, etc without setting keyframes from scratch. I am currently using the "Ease and Wizz" plug in from http://ianhaigh.com/easeandwizz/. It is awesome but I would love to be able to get realistic, smooth motion out of my projects without spending a ton of time on it.
One word, well three...Newton for After Effects (well...four). It's a physics system which works as a simulator in AE, and does things that would take months to do with keyframes; plus, it creates keyframes, which you can then apply to other layers, etc.
There's a demo version on the site, although it can be hard to get at, for some reason. Look at the demo, and play with the demo software - it's quite amazing: