I just updated this site to WordPress 3.1, and it took the site down. The automatic updated failed to update the site, and left the site in a permanent “500 Internal Server Error”. How to fix any failed WordPress core Update (3.1 included) Understand that one beautify of WordPress is that the core software is [...]
Help: WordPress Update to 3.1 (or any version) Crashed my Site is a post from: Sean Walther's Blog