Looking over my collection I absolutely love, love, love the extras in my Marvels 10th anniversary HC - scripts, treatments, so well put together along with Ross' sketches. Likewise for Daredevil Man Without Fear. Absolute Dark Knight (loved the memos), and Kingdom Come.
That got me thinking in our LOTR blu ray extended editions, Back to the Future blu ray with the other Marty actor....
What collected edition has your favorite extras/special features?