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What hardware information about your PC's can gathered by websites/ISP's?

I'm very curious about the limitations of the a capabilities of a browser to send the details of a computer's hardware and software details.

Here are some details point that I know about.

  • OS, Browser type, user IP address, Resolution of the display

Some people say some sites can have the computer's network interface mac addresses. (like google adsense)

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Let me preface by saying that I work for a company that identifies devices based on things that can be observed in the browser.

Nobody (short of exploiting a security vulnerability) can get your mac address (EDIT: Unless you run native code from them e.g. as a plugin).

For a good overview of what can be seen, have a look at EFF's Panopticlick:

http://panopticlick.eff.org/

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