mjar81

This plugin simply changes the default “Write” and “Manage” links in admin to go to pages instead of posts. This is useful if you’re using WordPress primarily as a CMS.

WP Pages Only

This plugin simply changes the default "Write" and "Manage" links in admin to go to pages instead of posts.

aueda

You can embed page, category, and archive menu in your Wordperss site. You can get documentation and view demos from following site: 
http://tempspace.net/plugins/?page_id=33
If you are annoyed with consumption of large amount of window space by page, category, and archive list, this plugin will be useful.
When the bottom of the menu seems to be out of the window, the menu is “multi-columnized” automatically. Also, when the right side of the menu seems to be out of the window, the horizontal position of the menu is 
automatically adjusted.
You can change font-size, color, spacing in the admin page easily.

Page Category & Archive Menu

You can embed page, category, and archive menu in your Wordperss site. You can get documentation and view demos from following site:

WP Pages Only vs Page Category & Archive Menu