How much do websites know about you?
A lot of people know to erase cookies and block various advertising sites if they use a web browser like Opera or Firefox. However, sites are still able to use Flash to collect information. Annoyingly, there is no good way to block sites consistently, and clicking that you don’t want to accept an advertiser saving your personal information on your own computer doesn’t work until the third or fifth time.
But at least you can see what they are storing with this: