Here's a shell script that makes it simple to burn DVDs on a *nix machine. Requires cdrtools v2.00.0 or greater and a reasonably up-to-date set of dvd+rw-tools. I use v5.19-220.127.116.11 on Leandra. Make it executable with the command chmod 0755 /path/to/burn_dvd and invoke it with burn_dvd /dev/dvd_burner /path/to/files-to-burn.or-iso-image. I've only tested it as root. If this script blows up in your face, it's not my fault or my problem. The script will output usage information if you don't supply any command-line arguments and is well-commented.