The sort index of a page is stored in the PagePeerOrder property. So you should be able to use that just as you use any other custom page property.
Don't know if that is enough information, if not please post a few more details and I might be able to help you.
Good afternoon. I have been searching for a way to display a pages sortindex inside a bound control. Am I missing something fairly obvious here. I need the actual index since we are going to be randomizing the items based on duplicate sort-indexes. Thanks in advance.