Here are the two popular Wordpress plugin that help you to collect the stat of your blog. The first one is Google Analytics and Feeburner Reports plugin while the second one is Slimstat.
Google Analytics and Feeburner Reports plugin
Have you ever wonder how you could combine the report of two most 
essential web analytic tool nowadays (Google Analytics and Feedburner) into a single page of your Wordpress admin panel where you can view it in 2 or 3 seconds? Google Analytics and Feeburner Reports plugin by tan tan noodle will help us to accomplish that. This is the description from the publisher:
WordPress by default doesn’t come with any sort of web site reporting tools (and it really shouldn’t). So if you want to know how many people visited your site, which pages they viewed, or where they came from, you’ll need to either rely on your raw web logs or use an online tracking service provided by a third party. There are many different third party web tracking services out there, but the two free and popular third party solutions that I highly recommend are Google Analytics (for web traffic) and Feedburner (for syndicated traffic).
If you’re the one who like to check blog’s stat everyday (like me) this plugin really come in handy. It help you to grab data from Google Analytics and Feedburner if you have registered with the two analytical service.
How to use: Download the plugin and uncompress. Upload it to your Wordpress plugin folder, and then activate it via the plugin page in administrator area. Go to “reports” and set it up according to your Google Analytics and Feedburner account id. Finish!
Download Google Analytics and Feeburner Reports plugin
Slimstat
Slimstat is a simple web stats analyzer based on ShortStat. Here are the features written by the plugin owner.
Main features:
* imports wp-shortstat tables and data
* halved db size compared to wp-shortstat
* liquid layout: optimized for 1024×768 and 800×600
* metatags to show stats on your blog (*)
* fully localizable
* improved browser and platform detection
* tracks Wordpress search form
* displays post titles for given resources
* daily reports by mail (*)
* shows visitors and unique IPs, not just hits
* can compress (aggregate) old stats to reduce DB size (*)
* use of a local ip-to-country database
How to use: Download the plugin and uncompress. Upload it to your Wordpress plugin folder, and then activate it via the plugin page in administrator area. Finish!
Download Slimstat Wordpress plugin