Have you been posting to a free blog, like Blogger, or Live Journal? There are a number of formats for blogs that WordPress can Import. You can move over your posts from these other platforms to get a fast start on this blog. If it's not a WordPress blog, there will likely be a number of adjustments to get things in the right place, but it may be worth it.
You would also use this function to import into a new WordPress blog if you decide for some reason to shut this one down and start over elsewhere, but you want these posts.

