You probably need an addin for this. PowerPlugs: Transitions IV contains
turning page of book effect which you might want to try it out:
Alternately, here's a tutorial that talks about creating 3D transition:
"Creating 3D Transitions in PowerPoint on the Cheap"
Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: March 23, 2007
New PowerPoint Webcomic
PowerPoint Heaven - The Power to Animate
> I can't seem to find a turn-page transition effect in powerpoint 2007. Is
> there one available - has anyone used one?