There are a few like that available in a powerpoint plugin called powerplugs transitions. It basically takes a screen grab of the end state of the page and one of the beginning of the next and makes a small movie file for the transition.. there are loads of them and all quite impressive.
I've used them in Opus by taking a screen grab of my Opus page and taking that into Powerpoint as a slide background image... then use a Powerplugs transition on the page.. it saves a video file that you can then use as a transition effect in Opus!!!
The new Powerplugs V has a turning page of book transition.. but it's not quite what you're looking for I don't think.
There a 5 volumes of transitions now - at $59.00 US each - but you can get bundles..
It might be worth a look.
It would be great if some of their products could integrate with Opus !!!!
http://www.crystalgraphics.com/presenta ... pecial.asp