Recently, there were discussion about many sites which are tracking the user via browser ETags/cache poisoning. Is there a way that the casual user can protect himself from such attacks?
Clear your browser cache often, there will be several places to clear out, depending on what OS and browser you use.
Vista and W7 IE8 and 9
Clean out this folder often, there will be odd numbered/lettered folders in here, delete them. This folder is hidden, even when you un-hide folders in Windows sometimes it still does not show when browsing in explorer, you have to edit the file path to include "/content,ie5" it will magically appear.
C:\Users\(your user name)\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5
Delete everything in this one regularly also
C:\Users\(your user name)\AppData\Local\Microsoft\Windows\Temporary Internet Files
Delete anything in this folder regularly, you can also mark this folder "read only" after you empty it, then the browser cannot write any new data to it. this is the Flash cookie folder for IE. I use this utility to make it easier to empty and disable flash cookies.
C:\Users\(your user name)\AppData\Roaming\Macromedia\Flash Player\#SharedObjects