Tor being pitched as a one-stop privacy solution like this is going to backfire bad at some point in the future. It is good that they have the warning about cookies, but there are a hell of a lot of other ways you can be identified. You simply shouldn't be using the same machine you use with your real identity with an identity that needs to be anonymous. Even simply things like ntp time sync request can give you away…
Browser Characteristic: bits of identifying information User Agent: 9.43 HTTP_ACCEPT Headers: 19.19 Browser Plugin Details: 21.51+ Time Zone: 7.13 Screen Size and Color Depth: 5.38 System Fonts: 20.51 Are Cookies Enabled?: 0.43 Limited supercookie test: 4.41
I'm a unique snowflake!
Total (assuming independence): 87.99 Word population (log_2): 32.73