All professional bloggers use a visitor/page counter service on their page. Most of us have used StatCounter for a while and now with StatCounter's improved interface, we can surely recommend our visitors to give it a try.
Here's the visitor data, which gives detailed report of visitors coming to your page.
Visual representation of the geographical area of your visitor/readers.
Screen below shows which search engine helps to locate your site/pages better.
Visitor data showing, the resolution of their monitor settings
Data about the browsers your visitors are using