I had been using an older 2.0* release of WordPress, and just upgraded to 2.1. I recently discovered that you have a choice of permalink structure. I unfortunately am using the default structure of http://www.raptorstalk.com/?p=31, but want to change to http://www.raptorstalk.com/2007/03/24/no-respect-from-espn/. So the first link works, but the second doesn't. Is it possible to change the permalink structure if you already have published articles? If so, how do you do it? Or am I screwed here? Thank you in advance for any help you can provide.