Macworld:

Check out Ghostery, a Safari extension (also available for Firefox, Chrome, and Internet Explorer). With Ghostery installed, whenever you visit a Web page that uses such tricks to track, you’ll briefly see a box listing all the services that are tracking your visit to that page.

Click the Ghostery icon in Safari’s toolbar, and you get a detailed list of each of those service along with the specific script(s) each is using on that Web page. Click a script to view it in a new Safari tab or window. Click the More Info link next to a service to view Ghostery’s page for that company, which includes information about the company; contact information; a link to the company’s full privacy policy; and a summary of the types of data the company collects, how that data is shared, and how long it’s retained.

I’ve been using Ghostery for a while and really like the way it reminds me of just how much tracking is going on and it shows you just how ridiculous the situation has gotten. One page I visited had 54 trackers on it. Needless to say, it was a painfully slow web site.