syncmedia is a shell script that syncs over the media folder in Magento installs. It excludes all of the necessary folders that don't need to be synced (cache, tmp, etc.).
Set the proper permissions on this file, update the host and folder in the script, and run:
./syncmedia.sh
This script assumes that you have SSH Keys setup for connecting to your remote host. If you do not, you'll need to modify the script as necessary.