PPTools
Image Export converts PowerPoint slides to high-quality images.
Shape Styles brings styles to PowerPoint. Apply complex formatting with a single click.
Merge Excel data into PowerPoint presentations to create certificates, awards presentations, personalized presentations and more
FixLinks prevents broken links when you distribute PowerPoint presentations
Optimizer saves disk space and bandwidth, "right-sizes" your PowerPoint presentations for email, screenshow or printing
PPT2HTML gives you full control of PowerPoint HTML output, helps meet Section 508 accessibility requirements
Prep4PDF preserves interactivity in PowerPoint presentations when you convert to PDF
3D Graphics
PowerPoint newsgroup regular Glen Millar has this series of tutorials that teach some very clever tricks for creating/simulating 3D graphics in PowerPoint.
If you're looking for more of a one-click solution, have a look at Perspector, a 3D add-in for PowerPoint
or
Deep Publish from Right Hemisphere
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