[GMail PowerPoint viewer supports PPT format only, not the new PPTX of PowerPoint 2007 - use the Office 12 converter]

PC Advisor – To access your presentation online, email it to your webmail account and open it from there. To read your attached presentation online, click the View as HTML link. Your PowerPoint presentation will open in a new browser window on any computer, with or without Microsoft’s PowerPoint software installed. Link.