The Google trick for converting a Word document to clean HTML also works pretty well for Excel documents and PowerPoint presentations.

Much better than anything provided by Microsoft for saving Office documents as a webpage (HTML).

Check out these posts too:

  1. PowerPoint and TIFF file viewing from Google in Gmail
  2. Powerpoint: Compress and Optimize Presentations (ppt) to Decrease Size
  3. Excel 2007 Web Data Add-In
  4. Convert a Word document to HTML (easy and free)
  5. Microsoft Excel 12's Pivot Tables
  6. Importing web data into a usable format using Excel
  7. Office Online File Converters and Viewers for MS Office