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I've read here that it's possible for a website to use cross site scripting to pull your router's MAC address without your permission. This can then be used to determine your location through Google Location Services.
What other information can be sent that can personally identify your hardware? For example, is there a flash plugin that sends out info or ID numbers about your graphics card? I know User Agents send out info about your browser, but do they also include hardware information as well?
I don't think any details of hardware are sent. A MAC address wouldn't give away location either. An IP can give it away in a general sense.. but I think that's more ISP's Router. Which would be within x miles. – barlop – 2010-11-28T04:59:08.107