Anyone hosts images remotely? (High traffic server)

Some of our blogs have a little bit more traffic than expected, and we are having troubles with afforting it, we now moved to a bigger dedicated server, dual Xeon Quad core, 4gb ram, and a MySQL dedicated mini server (I think its a P4 2gb RAM)

We are wishing to move all images to another server, a cheaper VPS in USA wich will be hosting only images and themes of these blogs.

Anyone has done it? how?

Our blogs are blog1.ourdomain.com blog2.ourdomain.com etc… the idea is something like media.ourdomain.com

We are thinking on a linux virtual link to the remote server, or something like this, to be transparent to wordpress and do not hard-code / modify it.