Thanks for the support!
I think I understand what you are saying. If I get a 3D template I will be able to place a DVD cover image over it and it will render it. Is that correct? Now, where can I find a 3D obj template?
actually, I have a feeling that photoshop won't be able to render the image. I could be wrong here - but it just seems like too large a feature to add to photoshop - an industry standard image editor AND a 3D render engine.
Even if it can do basic renders (and again, I can't say for sure since I haven't used the feature), I doubt it could do high quality renders with proper lighting setup with radiosity and all that.
I don't think that using JUST photoshop with a 3D object will be the solution you need.
Through google, it's possible to find free objects online. A couple of years back when I was studying Lightwave, I came across a fully detailed Subaru WRX model, complete with full texture setup. It was so detailed that my computer at the time couldn't even finish displaying a low detailed preview in the modeler.
Anyway, here's some links you might find useful.
3D DVD case
here
There are some very detailed ones out there, but at a price
Link
Link to some free Blender objects
here
May not have a DVD case, but you might be able to request one. Having a Blender objects means you can have the app and render engine for free.
If you want to do it cheap, I'd personally go with Blender, and try to find or request a DVD case from a Blender site. If you're confident, you could model your own one. Unfortunately, there doesn't seem to be an equivalent of the app you listed originally, so one of these might be your best bet.