I was going to wait until we got closer to the mark before I announced it, but as I did for the 750,000th post, I intend to give away stuff to the person who posts post #1,000,000 - and also 999,999 and 1,000,001.
But I'm waiting until we hit at least 990,000 to make the announcement - 10,000 posts takes a lot longer to happen than you might think!