Microsoft's Mactopia site has tons of information on PowerPoint:mac.
Use the Apple Remote with PowerPoint or Keynote using PocketMac Remote.
Review of MathType 6 for Macintosh
Steve Rindsberg's PowerPoint FAQ has a Mac section.
The PowerPoint:mac newsgroup archives can be accessed on Google Groups.
PowerPoint:mac MVPs Jim Gordon and Mickey Stevens provide useful information on their sites.
Learn how you can create amazing movies from PowerPoint using Snapz Pro X.
InsertPicture for PowerPoint:mac allows you to inserts tons of pictures at one go into your PowerPoint presentation.
Find templates for PowerPoint:mac here...