Question

best place to ad a visitor counter script?

Answer 1

I'd suggest Google Analytics, you can paste your code in the box for the head section in the admin area. See http://question2answer.org/qa/7609/google-analytics

Comments

I thought they meant something like this:

http://www.phpjunkyard.com/php-text-hit-counter.php

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Q2A counts views on questions so if you want a visible counter you can use those numbers. If you want a hidden visitor counter, then Google Analytics is by far the best option.