If you'd like to fight back you can learn to surf anonymously. It's easy and fun!
In other words, use Tor. Credit this info to Computerworld , via the Consumerist.
I've used Tor.
I'll use it again.
In some cases, I don't mind websites knowing that I've been there before, and the inevitable autopopulate of my username just about everywhere, especially when I don't use Firefox. On the other hand, there's only so much I can take.
