It uses N3xt-D embeded in the preview window, which is nice because Irrlicht is pretty fast, but couldn't get antialiasing into the preview (only works in the final render) due to wrapper restrictions. :roll:
The Blurb
BoxMagic is a versatile tool for rapidly designing and deploying high-quality 3D box images and virtual packaging for a variety of media; including DVD cases, CD Jewel cases, books, business cards and screenshots.
BoxMagic does all the hard work for you, instantly transforming your flat cover designs into rich, engaging 3D images of your online products, which your potential buyers will want to reach out and touch, giving them a powerful incentive to purchase, while giving you total control over the appearance, shape, lighting and angle of your box-shots.

Features
- 20 packaging styles, including DVD cases, books, CD Jewel cases etc..
- High-quality results with minimal effort
- Full control over camera angles, lighting and filters
- Saves images in .BMP, .PNG or .JPG formats at any size
- AntiAliasing, Anisotropic filtering and shadows give a professional finish to your box-art
- Works with DirectX, OpenGL or Software renderers for wide support of hardware setups
My server is acting wierd with external links, so if anyone wants a demo, pm me your email and I'll shoot one over.
More info on the blog, or the BoxMagic Page.

Update: Demo now available here.
Update 2: Video - Making a box-shot in less than 2 minutes: http://www.youtube.com/watch?v=5Qpg-tsT46I