]Google Desktop Search might just be too good. Using the new
]software, I was able to bypass user names and passwords that
]secure Web-based e-mail programs and view personal messages sent
]and received on public PCs.

]Using Google's new software on a shared computer at the Google
]booth at the Digital Life trade show floor I was able to easily
]search for, find, and read private Yahoo e-mail sent on the
]computer by previous users earlier in the day.

]Marissa Mayer, Google's director of consumer Web products, told
]me she wasn't surprised. "This is not a bug, rather a feature,"
]she says. Google always intended people to be able to index and
]search Web-based e-mail viewed and composed on PC, she says.
]Google Desktop Search is not intended to be used on computers
]that are shared with more than one person, she say.

She specifically said it was not intended for shared computers.

Hmmm, It been years since I checked, but back in the day Office used to do this index feature called "Find Fast" for Office documents. Most everyone disabled it because it killed what was already terrible hard drive performance. I wondering if these index files are world-visible, and if new versions for office do it.

Google Desktop Search: Security Threat (The other side)