Are there any HD-DVD's that have extra special features..?

Just wondering, now that the "second format war" is over... Anyone know of
HD disks that have extra stuff on them that would make them worth
collecting? I'm thinking of how some LaserDiscs for certain films (like
Nicholson and Fletcher's commentary track on One Flew Over The Cuckoo's
Nest) had nice goodies that will probably never see the light of day on any
other format...