Chetan Gole

This plugin will give special smooth scroll effect to your BACK TO TOP, TOP TO BOTTOM like links. 
It also has capacity to add such links in your WordPress blog, if they are not present.
You can special <a href="http://www.thechetan.com/smoothscrolllinks/" rel="nofollow ugc">add smooth scroll effect</a> in your blog for page navigation links.
By <a href="http://chetangole.com/" rel="nofollow ugc">Chetan Gole</a>.

Smooth Scroll Links [SSL]

This plugin will give special smooth scroll effect to your BACK TO TOP, TOP TO BOTTOM like links. It also has capacity to add such links in your Wordp …

Tobias Nyholm

This plugin creates a widget menu of the pages related to the current page. You define where in the page hierarchy 
to be the root of the menu, and you define the depth. Now you have a simple and dynamic navigation menu. 
The benefits with this plugin compared with a predefined menu is that this menu can change from one page to an other. 
For more information see installation page or the 
<a href="http://www.webfish.se/wp/plugins/dynamic-subpages" title="Webfish - WordPress plugin" rel="nofollow ugc">Webfish</a> homepage.

Dynamic Supages

Displays subpages for the current page. Set the depth and starting level (in hierarchy) and you are good to go.

Smooth Scroll Links [SSL] vs Dynamic Supages