I agree with etsell. I completely understand the purpose of pages, but being able to set a future time on a timestamp for a page would allow that page, or it's edits to go live at a certain time without the need to do it manually would be time saving. For example, on one of my client's web sites, I'm using WordPress as a CMS and so I have far more pages than posts. It would be helpful to make a page about some special event at any time and be able to tell it to go live at a specific time in the future without having to leave it unpublished, then remember to publish it when I want it live.
WordPress 2.5 has timestamp option when editing pages, but I'm unsure how they affect the publishing of the page. I haven't done any testing with it yet, and theres little to no documentation on the unique features of 2.5 as of yet.