One of the changes in WordPress 2.7 release is the disappearance of page id column from the admin console. As far as I know, currently there is no way to display the page id column.
Page ids can be used to exclude or arrange links to the pages in the navigation menu.
I use page id to exclude certain pages from appearing in my navigation menu.
So, without the convenient page id column how do you determine the page id for a particular page?
There are some plugins available that add the page id column back to your admin console.
But there is a simple way to determine the page id without installing any plugin.
Here is what you need to do to find the id of any page.
Log in to your WordPress admin console.
Click on Pages link, to go to the Edit Pages page.
You will see a list of all the pages with their names hyperlinked.
Hover your mouse over the name of the page whose id you need.
Keep an eye on your browser’s status bar.
In the status bar, following the name of the page you will see something like “?action=edit&post=12”
The number after “post=” is your page id. (12 in this example).
Until WordPress re-introduces the Page ID column this is the simplest way of determining the ID of a page.