So, I've been crazy about getting Qt3D compiled for Maemo 5. I went as far as trying to compile the full Qt source on the N900, because Scratchbox is so hopeless.
But, a couple of minutes ago, I found the official Qt FTP, and how do you know... The libraries were right there!
These libraries are interesting for many reasons: They let you write next-generation OpenGL apps, easier than ever, and also give you access to lots of new goodies, so you won't have to write it all by yourself.
This is the location:
ftp://ftp.qt.nokia.com/qt3d/maemo5/current
I hope that you'll find this as useful as I did.

The actual goal behind Qt3D is to make a unified way of writing OpenGL apps. Right now, the normal way is writing for a specific platform: OpenGL or GL ES. Qt3D is what should have been: One way for all platforms. And as far as I can see, this works well.