Presenting geospatial data in Powerpoint

PowerPoint KMZ/KML to Google Earth (via inserted object and hyperlinking)

Save a Google Earth .kmz file on your computer and insert it as an object. When the Insert Object dialogue pops up choose Create From File and browse for the selected file. In PowerPoint, right click the new object and choose Action Settings.

In the new dialogue, select Object Action and Activate Contents. Finally you might want to improve the visual appeal of the Object, which can be done using Format Object

Accept the Warning Notice

While the question has been answered very well (and this is very late), here's an "aesthetic" solution for those getting here via Google (like me) that I just did recently for a Powerpoint:

(1) Insert screenshot of the KML in Google Earth to the Powerpoint
(2) Right click the screenshot to add Hyperlink...

You can put Google Earth in your PowerPoint presentations with Shape2Earth.