This extension stores Magento's media files on Amazon S3. It is installed as a Magento module without hacking Magento's core. Works with Magento Community 1.5.1.0

Highly experimental at the moment!

• Modman required: http://code.google.com/p/module-manager/

curl http://module-manager.googlecode.com/files/modman-1.1.5 > modman
chmod +x modman
sudo mv modman /usr/bin

• set "Allow Symlinks" under System / Configuration > Advanced / Developer > Template Settings in Magento
• Install via modman (for details consult modman website):

cd 
modman init
modman magneto-s3 clone https://github.com/sstoiana/magneto-s3.git

• Make sure you've cleaned Magento's cache to enable the new module
• The extension configuration is under System / Configuration > Advanced / System > Storage Configuration for Media
• Change "Media Storage" to S3, enter your Amazon S3 credentials

It's not there yet...

• store Magento's media files on Amazon S3
• works with category images, catalog products' images, thumbnails, CMS images, concatenated JS and CSS files

We're working to correct these:

• Changing File Storage back to "Filesystem" doesn't work yet
• Not completely tested
• Right now, the "Amazon S3" storage overrides "Database" storage