I just found a handy WordPress plugin that I have been pining for. It’s called Page Links To. This plugin allows you to add a link to a URL outside of the WordPress managed site structure, and have it show up in your navigation without hacking the Pages widget or template. The new link will show up anywhere the wp_list_pages(); function is used.

Once installed, the process is very simple. Create a new Page. Enter the desired link name in the Title field. Then, in the newly added Page Links To field, enter the URL that the new Page link should go.

I used this on a 2.7-beta3 install of WordPress.

WordPress Plugin: Page Links To by Mark Jaquith