Forum Moderators: DixonJones
1. cookies - by disabling persistent cookies, you can prevent a website (or network of websites) to track your browsing pattern across multiple sessions. Each time you close your browser, any cookies you have received will be deleted. The main drawback is that this will disable any website auto-logins or specific settings you may have enabled.
2. toolbars - assistants, helpers and other gimmicks that you might want to install as a browser toolbar will periodically phone home while you are surfing the web. Some of this may be legit, some of it may not.
3. websites that you register for - Social networking sites or webmail services may be interested in following your activities while you browse their site. Which topics interest you, what opinions did you express, did you make any purchases?
4. geolocation of your ip address - great for targeted advertising, or to display varied content (e.g. languages) depending on a user's location. You could consider using a proxy that does not relay your original ip address.
5. data harvesting at the ISP level - search for Phorm, Nebuad, Carnivore ;)
The list could go on for a while, let's see a few more from other WebmasterWorld members... Flash cookies, user agents, hopcounts, private browsing, browser anti-phishing features, omnibox, anonymizers, hosts file anyone?