This is my two thousandth post on this blog. The first post was just an automated test post that was created when the blog was, but it was first damn it, so it counts. That post was at 00:23 UTC on 12 Jul 2003. I started this post at 03:37 UTC on 12 Sep 2008. The time between the two posts was 1889 days, 3 hours and 14 minutes. So my average time between posts has been... 22 hours, 40 minutes and 51 seconds.
When I reached 1000 Posts on 13 Jan 2007 my average had been one post every 30 hours, 46 minutes and 37 seconds. So, in addition to the fact that it took 1281 days for my first 1000 posts and only 608 for my second thousand, it looks pretty clear that I've sped up a bit. For this second thousand I've averaged more like a post every 14 hours and 36 minutes.