It's nice to finally have a standard design rather than the ugly, completely random DVD case designs we've seen over the years.
There's also two types of Blu-ray cases - the locking ones, and the newer non-locking ones. I prefer the old ones a lot more, but the new ones are definitely not as flimsy. Also, I love the smaller design, as I can fit more than 30 on one shelf next to my PS3.