I discovered a DVD case mechanism that I hadn't seen before today. It's a Forward Electronics design called ``M-Locking Mechanism'' (US Patent 6,227,362) and it's kinda neat. (Note the site that image is from: DVD Cases and Hub Images. Also neat.)

There are a pair of arms that stick straight up to align the DVD hole. Then the central portion of the mechanism is cantilevered against itself. It prefers to be in one of two positions. When open, there are arms to the side wider than the DVD hole, and there are two arms that point upward. To close it, you push down on the interiormost point of the disc. This forces the wide arms down and the upward pointing arms swivel over the top of the disc.

While pushing down on the disc is potentially detrimental, the disc is completely stress-free once closed. I suppose this is the case with the Amaray, too, but somehow I like the active open and closed states instead of the sprung Amaray. I still think the Amaray is better, but this one's neat.