Browser Privacy Test
lazyforker writes "A NYTimes blog post reports the results of security researcher Kate McKinley's tests of various browsers' (FireFox, Chrome, IE, Safari) privacy protection mechanisms. Specifically she tested their cookie handling. She also examined their handling of Flash's cookies. In summary: Safari on Mac OS X (in the 'private browsing' mode) is not so private ('quirky'). Safari on XP is not private at all. Flash behaves awfully everywhere."
Flash behaves awfully everywhere
FlashBlock
NoScript works too but I find it sort of annoying because it stops half the web from working.