If you handle many post types on your websites, it is useful to have them listed in a widget, linking to the archives for each post type. Widget can include posts count for each post type and it is very easy to set up.
To set it up, select post types that you want displayed in the list, select if you want posts count and extra CSS class for current post type. Cache for the widget is also recommended. Each post type item link will lead to the archives page for the post type (requires WordPress 3.1). Posts, pages and media post types will lead to the website home page.