Yup : Blue book if the session is closed (multi-session)
Yellow/red book if it's mixed mode.
You can do it cross platform (including intel / PPC) , but you have to make the content twice. (well export the content twice .. there's also some funny permission tricks to get right).
I did these in college ... thought it was the coolest thing ever, and would have a booming business. umm. . . I don't do them anymore.
If you really want to get into it ... Buy Macro-media Director and read up on 'Lingo'. There's a couple Xtras you'll need ... but you can make cross platform content (interactive) with the best of them that way ... burning the multi-session disc is easy. It's what content to put on that second session that's the hard part. (oh yea ... and support).