I found a group of plugins that are great for wordpress plugins. These only work for Wordpress versions 2.1 and above.

The first one is WP Useronline 2.11 plugin. It will display inside your dashboard, the number of registered members, guests, and robots that are currently on your blog in the last 5 minutes. It will tell them what url on your blog they are looking at and where they came from. You can download it here

The next is called the WP Stats 2.11 plugin. It will display general statistics about your blog such as top commenters and their profiles and the most commented blog posts. You can download this plugin here

Another good one I found was the WP Postviews 1.11 . It will tally up the top 10 most viewed blog posts. This is great for finding out which of your blog posts is a hot topic at the moment. Download it here