DVD-9 Compatible? And Bit Rate Q

Anyone know if the xbox 360 is DVD-9 compatible… I believe the games are made with DVD-9, not sure. I found a site at one time that gave a bunch of brand models and told if they were divx, dvdr, dvdrw, etc. if anyone knows this site.

When I burn video with nerovision express 3 there is an option to change the bit rate of the the project, what exactly does that effect? I usually just put it as high as I can.