Michael D Mays wrote:

Is there any way for someone to see any personal information about my machine 
over the internet via a web browser?

The user-agent string can be used in some circumstances for limited user tracking:

Browser Versions Carry 10.5 Bits of Identifying Information on Average
<http://www.eff.org/deeplinks/2010/01/tracking-by-user-agent>

You can see your user-agent at this site:
<http://whatsmyuseragent.com/>

There are other methods of tracking your movement from site to site, but as with user-agent strings they're very limited to all but court-ordered ISPs.

One can use Tor (there's a Firefox plugin available) to mask your IP, and there are also plugins for modifying your user-agent as well.

Ironically, it's been said that making any obvious change to your security setup may make your movements more interesting to systems like Carnivore and Echelon than just leaving things with their defaults.

For myself, as interesting as Tor is it's way overkill for my own needs.

I run with NoScript and a cookie blocker on, selectively activating scripts and cookies as needed. Even that's at the edge of what my patience can endure, but at least I get to decide when I'm being cookie-tracked.

--
 Richard Gaskin
 Fourth World
 LiveCode training and consulting: http://www.fourthworld.com
 Webzine for LiveCode developers: http://www.LiveCodeJournal.com
 LiveCode Journal blog: http://LiveCodejournal.com/blog.irv

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