I have been researching some reported items showing on Google and found what I believe to be a concern for people with private data, private feeds, files, or private pages viewed. Users that install the Google Desktop client could unknowingly be sharing content with Google and thus revealing information on Google search results of chats, private web pages and such on their machines if they have the sharing option enabled. While the person with the machine may be willing to share the administrators of the web sites with private login requirements may not prefer their content to be shared. Now I can see why many companies including Autodesk IT groups forbid Google Desktop to be installed in their group policies. Those with web sites can possibly limit this indexing and sharing by making sure you have a tough robots.txt file in the root as well as the NO FOLLOW , NO INDEX and also noarchive attributes in the header section of all pages.
I shared the following yesterday in my Google Reader Feedlist They are available as a page at http://www.google.com/reader/shared/07276097266275194453(and there's a feed too)
This is somewhat related and funny.
Wrong Turn Down Google StreetView (from Gearthblog.com)