I haven't had a chance to watch much of the extras yet, but I've enjoyed those which I did. I watched disk one of the commentary. There are a lot of interesting things in there, and the humor of Billy Boyd and Dominic Monghan really help keep your attention. I find that when it goes too long with just factual information it tends to lose my attention. Maybe I just have a horrible attention span.
I also watched the short piece with Ngila about the costume. I loved this section, because I love the costumes, and I wish it had been longer. The close up shots of Eowyn's gowns are wonderful, because they are some of my favorites, particularly the green gown. I was pleased, we well, to see some shots of her in her blue gown that weren't just of her shoulders. I was displeased, however, that the stills gallery did not contain pictures of this gown... only the underdress with the robe. Ah well.
Lastly, I've watched the piece about the horses. I loved this piece... I mean, I've been a horse lover for years, and I even took lessons for quite some time, so this was of particular interest to me. I loved when they talked about the training of the horses, and I got the biggest kick out of where they talked about "riding the barrell" (oh David Wenham... you saucy man... hehe). I also liked at the end, where they talked about how some of the cast and crew purchased their horses because of the relationships they ha built with them. How lovely