Would be awesome to have a downtime "render net database." A program waits for a certain period of inactivity and then launches lighting. You submit your IP adress to the list and download the list from the web. You need to have the router configured as analog-x has done. Then when you need to render something, just press the refresh thingy and some computers should be on and waiting. But...most people have dynamic IP adresses, and big bryce files take forever to send over a 15k/up connection.