Simple Wordpress counter-plugin with no external libs - saves timestamp, visited URl, referring URl and browserinformation in database, and can display total hits, unique hits and other statistics in WordPress webpages. Admin-interface available with detailed information. Counterize II 2.13 doesn't store any IP information, because this is illegal in some countries (e.g. Germany).
Counterize stores only a small hash to distingiush between different users and to get information about the user count.