The popular iOS and Android application “Rainbow – sync your data between cloud services” now supports File Sharing with a link!
The process is even easier than the one to transfer files, as the only thing that you have to do is to select the files that you want to share, and then email the link to your friends.
Currently, you can share files from the Dropbox, MediaFire and SugarSync cloud services, and you can share those files for up to 4 hours.
The Rainbow application is available for iOS, Android, Kindle and Blackberry devices.
Here is a link with some info about file sharing