Say you have a sneaky employee who thinks hes smart by clearing the history:
Almost all sites, whether online game or porn, have some type of flash content, even ads. Information of these flash objects is stored here:

C:\Documents and Settings\USERNAME\Application Data\Macromedia\Flash Player\#SharedObjects\[random numbers]\[folder names of sites]

Heres my example:
[url]http://img**8.imageshack.us/img**8/464*/testpf*.png[/url]


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btw if anyone likes having fun with the phone heres a fun site. [url]http://www.relaycall.com[/url]
Its made for deaf people wanting to call people. So you can call someone and type 'screw you' and some operater will say and type their reply back its pretty funny. - i take no ****** for any damages made