evasi0n has just been updated to version 1.1 to address issues some concerning long reboot times and problems that were causing the Weather app to crash. If you've already jailbroken on iOS 6 or 6.1, there's no need for you to do anything if you aren't having issues. If you, however, haven't jailbroken yet, you'll want to download the new version first.
Over on Twitter, planetbeing has pointed out that if you're already jailbroken, there isn't anything new that requires you to rerun evasi0n -
evasi0n 1.1 has been released on the site with the latest fixes. You may have to clear your browser's cache to see it. Note that you do not need to download evasi0n 1.1 if you've already jailbroken.
If you haven't already jailbroken but plan to do so, just make sure you download the updated version before performing the process. If you've already been to the evasi0n website, you may need to clear your internet cache to see the update or you can grab it from our downloads page linked below.