]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.

Google Desktop Search: Security Threat (The other side)