! -- UPDATE - I would recommend that you use Version Control via Git now instead and Wp Sync DB as this is my new more reliable system that I use. Its much better and I will get a video up ASAP. --
Are you a website developer ?
Are you sick and tired of developing on Localhost and not being able to switch between machines.
This video will help you setup a sync using MAMP and Dropbox to allow you local development across multipul machines.
You can get dropbox using this link - https://db.tt/Z1ID2pSb
Here is the Terminal code you need
cd /Applications/MAMP/db/
ln -s ~/Dropbox/Server/mysql mysql
On the second line make sure where it says Server you rename whatever you called your folder within dropbox.