I was able to perform a WordPress 3.0 upgrade yesterday. It went without a hitch. Making a single blog into a multi-site blog was a bit more involved. It wasn’t entirely a smooth transition because WordPress somehow detected that I already had a network running, which was simply not true. I ended up cutting and pasting several pieces of code to configure wp-config.php and .htaccess. In the end, the upgrade was a success.
Just a couple of minor things that I want to mention. The current version of of the Google Sitemaps plugin no longer works with WordPress 3.0. I’m not sure why. I also ended up removing the ‘blog’ slug from the permalink, so that it didn’t break my old permalinks. I also had to reconfigure the plugin called ‘Download Manager’ because it didn’t work after the upgrade.
This is probably the most involved WordPress upgrade I have done. It’s was involved because there were a large amount of features and enhancements in this version as well as merging WordPress and WordPress Mu. Congratulations to the WordPress Development team for making this release a huge success.