Use jQuery Vertical Scroller plugin to display posts as a vertical scroll in a widget, post or page. Supports multiple instances.
How do I use it to scroll posts? - To scroll posts in your widget, set the 'Post Type' to 'post' and set the category to the numeric identifier of the category you want to scroll.
How do I use this plugin to scroll custom post types? - To scroll custom post types, set the 'Post Type' to your custom post type. In this case, you would leave the category field empty if you don't have any categories. Otherwise, you can use the category id of your custom post type.