Dropbox is one of the most popular file sharing and syncing tool and it is one of the easiest as well. Dropbox Widget is a nice extension for Google Chrome which allows you to access your Dropbox files right inside the Chrome. Once installed, you can sign into your Dropbox account and view all the files stored in your account. You can also download files easily using the Chrome widget.
There is also option to view your recent activities in Dropbox.