The talk module removes comments from the node page and puts them on a separate tab. This style of commenting is very popular on Wiki sites (usually called the "discussion" page) and on news websites where the goal is to separate user generated content from editorial content.
When installed this module will add a tab to the set of tabs at the top of a node view page like "View | Edit | Talk" and provides a link at the bottom of the node to go to the talk page and view comments.
The latest version gives the option to name the "Talk" tab whatever you like. Go to Admin -> Site Configuration -> Talk page to change this.
You must enable the Talk page for each content type you wish to use it on. The Talk page is disabled by default. To enable, go to the comment settings for the content type.