There is this program by Ex0skelet0r of emutalk.net called ExoBoot
It's a program that makes Dreamcast images selfboot but this provides a nice GUI.
It's very simple to use, and has many options. It's very user friendly and great for people who are new and want a nice and simple interface.
Here is a link to the latest version (version 1.31)
http://www.emutalk.net/showthread.ph...e=18&pp=15
