Best way to track unique visitors?

Statcounter fails at tracking unique users properly because of this: http://statcounter.com/support/knowledge-base/24/
That problem results in one visitor possibly being counted several times and ruining the stats. Please tell me what you use to track unique visitors.

Did not know that Statcounter still exists. Why would you use statcounter when u can use google analytics ?

Take a look at Piwik, self hosted stats- works well for me

All you need is an img tag on your html files whose source is a simple php file that returns the content type of a gif and drops a cookie so that you know if you're serving a page to a unique or returning visitor. The same php file will simply log to a file or db the IP address, referrer and the most common http variables so you can build nice graphs off those...

If you feel creative you can step up the game and go for etags, html5 canvas tracking and flash cookies that will likely track unique visitors cross-browser on the same machine...

If you want an advanced tracker then use p202. It has a free version.