GMail PowerPoint file viewing
If you use GMail, try searching your email for "pps" - the extension for PowerPoint slideshow attachment files - then select "View as Slideshow". Very cool. Now if Google adds a service like Gliffy online diagram editor to the Google Office suite, then they will have a real office replacement: web applications that are less capable that desktop applications like OpenOffice.org but are a big win when it comes to group access, search, etc. I have started writing papers less than 3 or 4 pages, notes on how to configure servers for Tomcat, Seaside, etc., ideas for technical and creative writing, etc. on Google documents. For me, the one last 'must have' feature for Google documents is a technical diagram drawing tool with the ability to embed figures in Google word processing documents.