Extension Request: Auto-add entry ID to URL?

Not sure if this is possible, but is there a way to auto add the entry ID, or maybe just a number increment, to the URL, maybe by extension? Google News requires a four character number in the URL for it to index the entry. This means that I need to manually key it in, which in turn means that blogging tools like MarsEdit and Ecto are of no use 😉

Thanks!