First what is DNS (Domain Name Servers)

If you spend any time on the Internet sending e-mail or browsing the Web, then you use domain name servers (DNS) without even realizing it. Domain name servers, or DNS, are an incredibly important but completely hidden part of the Internet. The DNS system forms one of the largest and most active distributed databases in the world. Without DNS, the Internet would shut down very quickly.

What is a Cache?
Basically (in easy to understand terms) a cache is your computers way of making things faster for you. Basically when you visit a website it takes a snap shot of the visit so that if you go back to it then it will show you the snapshot to save time vs actually taking you to the site. Generally your computer will verify the the address with the server (The DNS) to make sure it is correct.

So why do people dump their cache's?

When surfing online there are many things you can do to protect yourself. Here are just a FEW of the things you can do:

Checking the "Keep me signed in" box on public PCs

• NEVER, ever, check the "keep me signed in" box if you're not using your personal laptop or home desktop
• Be careful with work computers. Your office PC might feel "yours" but others can easily snoop when you're away from your desk. They could do something as simple as forward all your messages to their own private email account
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WolframAlpha is not just another search engine - in fact it's computational knowledge engine: it generates output by doing computations from its own internal knowledge base, instead of searching the web and returning links.

Examples by Topic of what Wolfram can do can be found -:-Here-:- and in the youtube video's below.

Tab Candy is currently in Beta testing at Firefox and I'm really excited about it. I'm one who has a dozen or so tabs open at once, currently I have 17 open . Anyways with tab candy you can organize them, set them into groups or do a quick look to see what you have by looking at a little snap shot of them. Here is a little video that explains it much better then I can...