Keeping track of where you've been does not end with simply clearing out your browsing history and other private data—your operating system continues to store more information about what you've been up to, like cached DNS lookups and worse, Flash cookies that don't get wiped. It's worth noting that you won't be able to erase all of your tracks all the time—if you are browsing stuff that you shouldn't at work, you can still get caught by a system admin even if the history on your PC is gone. On your own PC, however, here is how to boost your browsing privacy