Now that 2.0.11 is officially no longer being supported, it's very smart of you folks out there still running 2.0.11 to upgrade as quickly as you can. You don't want to risk being hacked.
I wrote this tutorial to help you along the way. I recently upgraded our web design site and my personal blog from 2.0.11 all the way up without a hitch at all and am planning to upgrade my business partner's blog tonight. BTW, my personal blog has gone from Blogger to Greymatter to MovableType to WordPress, and from WordPress 1.15 to 2.8.1 so it's been through the ringer!!
It can be done folks, you just need to do the upgrade when you are in a calm frame of mind, with no distractions, make sure you back up that database, stash it in more than one place just to be sure, and proceed with the baby steps outlined in my article.