Given the rash of complaints about not being able to play dvd's I thought this link might be appropriate. I must say however that I'm quite puzzled as to why so many people are using scsi emulation w/ the 2.6.* kernel. It just isn't necessary. Remove that nonsense from your boot loader and you'll have things much easier without having to worry about so many symlinks and device names. Just link to the actual device name without scsi emulation like so:

$ ls -al /dev/cdrom
lrwxrwxrwx 1 root root 8 Jul 27 14:23 /dev/cdrom -> /dev/hdb

$ ls -al /dev/dvd
lrwxrwxrwx 1 root root 8 Jul 1 16:46 /dev/dvd -> /dev/hdb