The core Tracker module is a convenient way to look at recent traffic on a Drupal site. It shows a list of recently posted (or modified) nodes along with useful data items for each node. However with Views 2 there is a more flexible way to implement the same functionality, without enabling another module.
The task is really pretty simple. Just download and enable the Views module, then in the Views configuration interface enable the Tracker view. Yup, coming bundled with the Views module is a predefined view which does every task the Tracker module does.