Well, I admit it took more then a couple days, but the free After Effects preset, Quick Gravity is now online.
I recently posted a tutorial on creating gravity in After Effects. This preset takes all the work out of creating that same effect. Simply drag and drop it onto the layer you want to animate and you are ready to go. The preset comes with several easy-to-use controls that make customizing your bounce simple and quick.
For those of you who have seen the tutorial, you should know that this preset contains more complex functionality than what was described in the walkthrough. I encourage you to download it to see the improvements, for example I have coded it so that a bounce always happens on a visible frame, and added quick switches to turn the effect on and off as well as creating auto frequncy. The entire expression is coded with comments that explain everything that is going on. Please feel free to look through and add any improvements you see fit. If you make any interesting changes, please let me know, I'd love to see what you come up with.