My favorite science productivity apps--Dropbox

This is super cool.  Although there have been several programs that have tried to do this, Dropbox is the best that I have found to transfer and sync large files across several computers.  You can access your files from any computer that the program is installed on or from a web browser.  Best of all, it gives you 2 GB of storage for free (if you want 50GB there is a fee).
Key features:
1. Easily share files with collaborators
2. Super fast uploads and downloads
3. Looks like an ordinary folder on your PC or Mac
Science use case:
I think this is great for huge image files that I want to access on several computers or for sharing large illustrator files for figures with collaborators.
Video tutorial: